Beutler two-solution developer

Every fine-grain developer in this formulary is built on a large excess of sulfite. D-76 carries 100 grams of it in a litre, D-23 the same, and in both the excess is there to dissolve a little silver off every grain so that neighbouring grains stop touching. Beutler’s developer asks the opposite question: what does a negative look like if you take that sulfite away, and put in a real alkali instead of a token one?

The answer is three chemicals in two bottles, diluted twelvefold at the tank and thrown away afterwards. It is the first high-acutance formula this reference has been able to print with a source behind every weight.

!Whose account this rests on

Beutler published a darkroom manual of his own and the course has not read it. The Deutsche Nationalbibliothek catalogues four editions of Meine Dunkelkammer-Praxis, from W. Knapp of Düsseldorf in 1958, 1961, 1972 and 1978, and the author field of its catalogue record carries the same national authority identifier as the photographer Willi Beutler, 1903–1978. Nothing on this page comes from any of the four.

What the page rests on instead is five independent printings of the same three weights: Hans Windisch’s manual of 1956, the Encyclopedia of Photography of 1963, the British Journal of Photography Annual of 1966 and again from 1972, and Grant Haist’s Modern Photographic Processing of 1979. They appeared in three countries over twenty-three years, one of them prints the alkali as a different hydrate of the same salt, and they agree on every quantity. Aaron Sussman’s handbook of 1965 corroborates the working dilution and the time. The sources block at the foot of the page names the passage each was read from.

Agreement between five later printings is not the same as reading the originator, and the difference shows: on one point — the working dilution — the printings do not agree, and this page prints both rather than choosing.

Solution A — the developing agent and the small dose of preservative that is all it is allowed

Ingredient	Quantity	Form the source specifies
Metol	10 g
Sodium sulfite (anhydrous)	50 g	anhydrous, and Windisch specifies it "of the purest quality"
Water	1000 mL, added	Windisch prints "1,000 cc (32 oz.) water (boiled)" as a quantity at the foot of the list, not as a make-up volume, so it is recorded as water added. Boiled is his word and it is about dissolved air and dissolved calcium, not about temperature at the moment of mixing. The Encyclopedia of Photography and the British Journal of Photography Annual both print the same formula as "water to make" a litre, which is a stock two or three per cent stronger than Windisch's.
No source read for this page states an order for these two. The order given is the general rule of Kodak Limited's 1949 handbook, and it bites harder here than anywhere else in the formulary because this stock contains no alkali at all.

Solution B — the alkali, alone in its own bottle

Ingredient	Quantity	Form the source specifies
Sodium carbonate (anhydrous)	50 g	anhydrous
Water	1000 mL, added	"1,000 cc (32 oz.) water (boiled)" again in Windisch's printing, an addition rather than a make-up volume. The later printings say "water to 1000 ml". Sodium carbonate dissolves readily and warm water is a convenience rather than a requirement; no source states a temperature.

Mixed in the ratio — the working developer as first printed

1 part Solution A + 1 part Solution B + 10 parts water

To use add 50 cc (1.5 oz.) of A and 50 cc of B to 500 cc of water. Develop low-speed films at 65 degrees F (18 degrees C) for 7 to 10 minutes according to gradation.

Twelve parts in all, so the working bath carries 0.83 g/L of metol, 4.17 g/L of anhydrous sulfite and 4.17 g/L of anhydrous carbonate. The Encyclopedia of Photography prints the same ratio as "one part of A and one part of B to ten parts of water", the 1966 Annual as "1 part A, 1 part B, 10 parts water", and Sussman's handbook in Windisch's own millilitres.

Mixed in the ratio — the working developer as the British Journal of Photography Annual printed it from 1972

1 part Solution A + 1 part Solution B + 8 parts water

Working solution - 1 part A, 1 part B, 8 parts water. Developing times 8 to 15 minutes at 20 degrees C (68 degrees F).

Ten parts in all, so the working bath carries 1.0 g/L of metol and 5.0 g/L each of sulfite and carbonate - a fifth more of everything than the 1956 instruction gives. The Annual printed 10 parts of water in 1966 and 8 parts from 1972 onwards, with the stock quantities unchanged, and neither printing mentions the other. The course records both and does not average them.

Purpose

To develop a slow, thin-emulsion negative so that the boundary between a light area and a dark one is drawn harder on the negative than the lens drew it on the film. That is not a figure of speech: a very dilute, single-agent, non-solvent developer produces adjacency effects at every density edge, and the visible result is an image that reads as sharper than its measured resolving power says it should.

Windisch’s 1956 heading is the plainest statement of the intention any source makes: “A special developer for low-speed films (A Willi Beutler formula)”, printed in a chapter that also records that “there is much talk about a new German developer for low-speed films of which it is said that it will revolutionize miniature photography”. That is a contemporary’s note of the reception, not a claim about the chemistry, and it is worth having for exactly that reason.

Haist gives the design principle in one sentence, and it is the sentence the rest of this page hangs on: Willi Beutler found that any developer containing a high concentration of a silver halide solvent will give unsharp negatives with a loss of fine shadow detail near the emulsion surface. Every other decision in the formula follows from that finding.

Recommended uses

Slow films, which is what every source says. Windisch defines the target as low-speed film of 8 to 16 ASA; Sussman’s handbook names Panatomic-X, Adox KB 14 and Isopan FF. The 1964 35mm Single Lens Reflex Manual sets out the argument behind the choice — Beutler’s technique was to get fine grain by using a slow film, which has an inherently finer grain structure, rather than by using a solvent developer on a fast one.

Small negatives that will be enlarged a long way. The whole class exists because a 24 × 36 mm negative printed to a whole plate is magnified seven or eight times, and at that magnification an edge effect that is invisible on the negative is a visible line on the print.

As a one-shot bath, which is how Haist classifies it: “typical high-definition one-use developers are those of Beutler and Crawley”. Mix the volume the tank needs, use it, pour it away. There is no replenisher, no published capacity and no reason to keep a used litre.

As the teaching formula for what sulfite actually does. Three chemicals is few enough that every one of them can be changed and the change seen. Part VIII’s sulfite lesson and solvent lesson both argue that the preservative and the solvent are two different jobs done by one substance and that they cannot be adjusted independently. This is the published formula that separates them, by carrying enough sulfite for the first job and not the second.

When another formula is preferable

• For fine grain, anything else here. D-23 is the same developing agent with twenty-four times as much sulfite in the working bath; D-76 adds a second agent and a borax buffer; DK-20 adds a thiocyanate solvent on top of the sulfite. All three give a smoother negative and none of them gives this one’s edges.
• For a fast film. The 1964 manual is blunt: Beutler-type developers should not be used with the faster films. Anchell and Troop make the point from the other end, noting that Tetenal’s Beutler-derived Neofin Blue was the one optimised for medium and slow films.
• Where the print will be made on a cold light head, or wherever a long, uncompressed tonal scale matters more than edge sharpness. Anchell and Troop’s caution is that Beutler-type developers tend to compress tones excessively, and that a diffuse light source makes that worse rather than better.
• Where you need a published time for the film in your camera. Kodak publishes D-76 times for dozens of materials. For this formula the published times are 7 to 10 minutes at 18 °C and 8 to 15 minutes at 20 °C, with almost no film named against them, so the first roll is a test.
• Where the bath has to work all afternoon. No source publishes a capacity for this developer and its constituents are too dilute for one to be worth guessing. A tray of it standing between sheets is a different bath by the third sheet.

Mixing

Two bottles, and there is a reason they are two. Kodak Limited’s 1949 handbook states the general practice: developers particularly susceptible to aerial oxidation are often divided into two or three solutions in which the developing agent is kept separate from the alkali, which reduces oxidation. A metol solution carrying only 50 g/L of sulfite and no alkali at all keeps for a long time; the same metol in a carbonate solution would not.

Solution A: metol first, then the sulfite. No source read for this page prints an order, and the order is not optional. Kodak Limited’s rule is that where a formula contains metol, the metol is dissolved first, because it is readily soluble in warm water but only slightly soluble in sulphite solutions without alkali. Solution A is a sulfite solution without alkali — the alkali is in the other bottle — so this is the formula in the whole reference where putting the sulfite in first will most reliably leave undissolved powder in the bottom of the jug.

1. Dissolve 10 g of metol in about 700 mL of warm water and wait until the last of it has gone.
2. Add 50 g of anhydrous sodium sulfite and stir until clear.
3. Make up with water to the litre. Windisch’s own line is 1,000 cc of boiled water.

Solution B is one solid in water. Fifty grams of anhydrous sodium carbonate to a litre. It goes into solution readily and it warms the water slightly as it does; that is a heat of solution, not the violent one that caustic soda gives, and no source specifies a temperature for it.

The working bath is mixed in the tank and not kept. One volume of A, one of B and either eight or ten of water, depending on which printing you follow. Written the way this course writes dilutions, that is 1+1+10 or 1+1+8 — the numbers are parts by volume of stock A, stock B and water, so 1+1+10 means twelve parts in all.

🧮What twelvefold dilution leaves in the tank

Stock A is 10 g/L of metol and 50 g/L of anhydrous sulfite. Stock B is 50 g/L of anhydrous carbonate. Each contributes one part in twelve at 1+1+10 and one part in ten at 1+1+8.

Per litre of working bath	1+1+10	1+1+8
Metol	0.83 g	1.00 g
Sodium sulfite, anhydrous	4.17 g	5.00 g
Sodium carbonate, anhydrous	4.17 g	5.00 g
Total dissolved solids	9.2 g	11.0 g

Against that, a litre of D-76 at stock strength carries 109 g of solids. A Beutler working litre is about a twelfth as concentrated a solution, and the twelfth is not spread evenly:

100 g/L ÷ 126.05 g/mol = 0.793 mol/L, against 4.17 ÷ 126.05 = 0.033 mol/L

Sulfite, D-76 against Beutler at 1+1+10

2 g/L ÷ 381.37 g/mol = 0.0052 mol/L, against 4.17 ÷ 105.99 = 0.039 mol/L

Alkali, D-76's borax against Beutler's carbonate

Twenty-four times less sulfite, and seven and a half times more alkali by moles — before allowing for the fact that carbonate is a far stronger base than borate, so the difference in the bath is larger than the mole ratio alone suggests. This is not a diluted D-76. It is a differently designed developer that happens to be dilute.

One more ratio, because it is the one to carry away. Grams of sulfite per gram of developing agent: Beutler 5, D-23 13, D-76 14 — and 50 if you count only D-76’s metol. That ratio is what “low sulfite” means here. There is still enough to protect the agent; there is nowhere near enough to dissolve silver.

!Two printings, two dilutions, and neither is a misprint

The stock quantities have never moved in any printing the course has read, from 1956 to 1994. The dilution has moved once. Windisch in 1956, the Encyclopedia of Photography in 1963, Sussman in 1965 and the British Journal of Photography Annual in 1966 all give 1+1+10. From the 1972 Annual onwards, and in every Annual through Photo ’94, the same entry reads 1+1+8, with the developing times widened from 7–10 minutes at 18 °C to 8–15 minutes at 20 °C.

No source explains the change and none of them acknowledges the other. The course prints both, as separate combinations with separate citations, and does not average them. Whichever you use, write it on the formula version record, because a negative developed in this formula is not reproducible without it.

Behaviour

It is a one-shot developer and every source treats it as one. Haist files it among the high-definition one-use developers. Nobody publishes a replenisher, a capacity, or a keeping time for the mixed bath. With 0.83 g of metol in a litre there is very little agent to exhaust, which is the mechanism the sharpness depends on and also the reason a second film through the same litre is not a sensible experiment.

The stocks keep and the source will not say how long. Windisch’s sentence is that the two stock solutions “in well-stoppered bottles will keep for a long time”. That is the whole of the published evidence on keeping, and this page does not improve on it. What can be said from the general practice Kodak Limited records is why they keep: the agent never meets the alkali until the moment of use, and an unalkalised metol-sulfite solution oxidises slowly.

The alkali is the second control, and it is unusual. Windisch’s own instruction for a film faster than 16 ASA is not a shorter time but a lesser quantity of solution B. That is a control no single-bottle developer has: the operator can change the activity of the bath without changing the concentration of the developing agent, by pouring less alkali. Neither he nor any other source publishes how much less, so the quantity is the worker’s and the page will not invent one.

Higher temperatures are not recommended, in Windisch’s words. He does not say why. The obvious reading — that a bath this dilute develops so fast when warm that the times become unmanageable and the edge effects have no time to build — is the course’s reading and not his.

⚗No pH, and the course will not supply one

No source read for this page gives this developer a pH, at either dilution, and none gives a pH for a sodium carbonate solution at 4 or 5 g/L either. What is established is the shape of the answer. A carbonate solution is a buffered base sitting well above the region a borax developer reaches, and the practical evidence for the difference is in the published times rather than in a meter reading. D-76 develops Kodak Tri-X in 8 minutes at 20 °C with 2 g/L of metol and 5 g/L of hydroquinone working together; this bath is given 7 to 10 minutes at 18 °C with 0.83 g/L of metol and nothing beside it. The alkali is most of what makes up that difference. Part VIII’s alkali lesson holds what the course can source about the region each alkali works in. A number for this bath would be a measurement, and the course has not made one.

Image characteristics

Sharpness first, because it is the point. The Encyclopedia of Photography introduces the formula as one of the best known high-acutance developers; the Annual files it under “acutance formulae — for maximum sharpness at some loss of fine grain”. Beutler’s own claim, as Windisch reports it, is that he obtained up to 141 lines per millimetre with it. That is a claim, reported at one remove, on films and test targets that are not specified, and this page passes it on as a claim.

Grain, and the honest version of the trade. The Annual’s heading names the cost in the same breath as the benefit. Removing the sulfite removes the mechanism that stops developed grains clumping, so the negative is grainier than the same film in D-76 — and the technique’s answer is to use a slower film so that there is less grain to begin with. That is the trade the whole Beutler technique was built on, and the 1964 manual states it in those terms.

Speed is not claimed. No source read for this page publishes an effective film speed, a speed increase or a speed loss. A non-solvent developer has no reason to lose the speed a solvent developer loses, but that is a mechanism argument and not a measurement, and the course does not print it as one.

⁇The name on the bottle is not always this formula

Richard Henry’s 1986 densitometric survey tested a developer he calls “Beutler High Definition”, and states plainly what it is: the AH-16 developer of Altman and Henn and, according to them, similar to the Beutler “high-sharpness” developer. Similar is Altman and Henn’s own word, reported by Henry.

That matters for how his result is read. Henry measured that the developer so named markedly increases the acutance of Tri-X Pan but not of Panatomic-X or Royal-X Pan — a corrective worth having, since it says an acutance developer’s benefit is film-dependent and that the benefit was absent on the slow film the technique was designed around. But it is a measurement of AH-16, not of the formula printed above, and this page does not transfer it.

The course’s position: Henry, Altman and Henn are the sources for AH-16 and its measured behaviour; Windisch, Haist, the Encyclopedia of Photography and the Annual are the sources for the formula on this page. Where a developer is sold or discussed under a person’s name, ask which of the two you have.

Tonality, and the strongest caution on the page. Anchell and Troop find that Beutler-type developers “have a tendency to compress tones excessively, especially when negatives are enlarged with a cold light head”. That is an experienced practitioner’s assessment, stated as such, and it is the one claim here that contradicts the sunny reading of the formula. A compressed scale is the same phenomenon as compensating behaviour seen from the print end: useful when the subject is contrasty, a liability when it is not.

The mechanism

Development is the reduction of exposed silver halide, and Part VIII works the general case through.

AgBr(s) + e⁻ → Ag(s) + Br⁻

The reduction the developer pays for, per formula unit

What this formula is, mechanistically, is three decisions taken against the grain of every fine-grain developer of its period.

The first decision is to remove the solvent

Kodak’s 1928 primer states the fine-grain mechanism it was arguing for, using D-76 as the example: at that high a concentration the sulfite is a solvent for silver bromide and iodide, so as development progresses it dissolves a small quantity of each grain and thereby greatly reduces the tendency to clump. Beutler’s finding, as Haist reports it, is the same physics read for its cost: a developer with a high concentration of a silver halide solvent gives unsharp negatives, with a loss of fine shadow detail near the emulsion surface.

Both statements are about the same chemistry. Silver that dissolves at one place in the emulsion is silver that can be reduced somewhere else, and image detail that is dissolved is detail that is gone. The fine-grain school accepted the softness for the smoothness. Beutler did the reverse.

Fifty grams of sulfite per litre in stock A becomes four in the tank, which is far below the concentration at which the solvent action is significant. The solvent lesson records that the course could find no measured formation constant for a silver–sulfite complex and no measured solubility of silver bromide in sulfite solutions, so the argument here is a comparison and not a calculation: twenty-four times less sulfite than the developer whose solvent action is the sourced example.

The second decision is to put the alkali back

Removing the sulfite removes activity as well as solvent action, and something has to replace it. The 1928 primer notes, in the same paragraph, that adding carbonate to a high-sulfite developer increases the rate of development and accentuates the graininess of the result — which is a warning to a fine-grain formulator and a specification to Beutler. He took the second half and left out the first.

CO₃²⁻ + H₂O ⇌ HCO₃⁻ + OH⁻

The alkali reservoir: partly dissociated, and holding its hydroxide concentration as development consumes it

Carbonate is not just more alkali than borax, it is a different kind of base with a reserve behind it. That reserve is what lets a bath carrying less than a gram of metol per litre keep working for ten minutes instead of stalling in two.

The third decision is the dilution, and it is where the sharpness comes from

At 1+1+10 there is 0.83 g of metol in a litre. A film drawing on that litre exhausts the agent locally, in the layer of solution against a heavily exposed area, faster than diffusion can replace it. Beside it, over a lightly exposed area, the agent is barely touched and the bromide released by development has not been diluted away either. The two neighbouring regions therefore develop at different rates because they are neighbours, and the boundary between them acquires a light line on one side and a dark line on the other. Part VIII’s acutance lesson sets out the three conditions that produce this — dilution, reduced agitation and low sulfite — and this formula satisfies all three at once.

The absence of a second agent is part of the same design. There is no hydroquinone here, so there is no superadditivity and nothing to regenerate the metol as it oxidises. In a general-purpose developer that would be a defect. Here it is the compensation mechanism: the bath is meant to run down where it works hardest, and a partner agent holding it up would flatten the very effect the formula exists to produce.

And there is no restrainer. No potassium bromide, in any printing. The bath makes its own, one bromide ion for every silver ion reduced — and because it starts with none at all, every bromide ion in it came out of the film. Near a dense area the local concentration therefore climbs from zero quickly, and in nine litres of water per litre of stock there is nothing much to carry it away except agitation. That is the same fact as the adjacency effect, written as chemistry instead of as geometry. Part VIII’s restrainer lesson covers what an added restrainer would do to it.

Function of every ingredient

Metol, 10.0 g in stock A, 0.83 g/L in the working bath at 1+1+10. The only developing agent in the formula, and therefore responsible for everything the developer does. Metol is the high-activity agent of the classical pair — it works at moderate pH, it starts in the thinly exposed shadows and brings the whole frame up together, and it keeps working against accumulated bromide better than hydroquinone does. All of that is why it can be used alone at under a gram per litre. More metol would raise activity, shorten the time, and — this is the important half — reduce the adjacency effects, because local exhaustion is the mechanism and a larger reservoir exhausts less. Less would give a bath that dies before the highlights are finished. It is also the ingredient that sets this page’s safety level, being a skin sensitiser, and the reason 10 g goes into 700 mL of warm water rather than into a sulfite solution.

Sodium sulfite, 50.0 g anhydrous in stock A, 4.17 g/L in the working bath. The preservative, and nothing else — which is the whole argument of the formula. It scavenges dissolved oxygen and intercepts the oxidation products of the metol before they can go on to colour the solution, and at 50 g/L in a stock that contains no alkali it does that job well enough for Windisch to promise long keeping. What it does not do at 4 g/L in the tank is dissolve silver halide. More sulfite moves this developer towards D-23 — smoother grain, softer edges, and the loss of fine shadow detail Beutler identified; less would leave the stock oxidising in the bottle and the working bath browning in the tank. Windisch adds one instruction nobody else does and it is worth following: the sulfite is to be “of the purest quality”. A stale tub is partly sulfate, and sulfate is not a preservative; on a formula with this little margin the difference shows sooner than it would in D-76.

Sodium carbonate, 50.0 g anhydrous in stock B, 4.17 g/L in the working bath. The entire alkali and the entire second bottle. Its job is to hold the bath in a region where metol is fully ionised and active, and to keep holding it there as development pours hydrogen ions into the solution — which a carbonate does and a hydroxide does not, because only part of the carbonate is dissociated at any moment. More carbonate, or more of solution B in the mix, means a faster and more contrasty bath and eventually chemical fog, since there is no restrainer here to hold it down; less is Windisch’s own published instruction for a faster film. The Encyclopedia of Photography prints the same alkali as 58 grams of the monohydrate rather than 50 of the anhydrous salt, and those are the same amount of carbonate to within one per cent — 58 g of Na₂CO₃·H₂O carries 49.6 g of Na₂CO₃. Weighing the monohydrate as though it were anhydrous, or the reverse, changes the alkali by about 15 per cent, which on this formula is a visible change in contrast.

Water, and the one word Windisch adds to it. A litre for each stock, and he specifies it boiled. That is not a temperature instruction — it is about what is dissolved in the water rather than how hot it is. Boiling drives off dissolved oxygen, which matters to a stock that has to keep, and precipitates temporary hardness, which matters because calcium and magnesium form a scum in an alkaline bath. Kodak Limited’s own note on stock solutions belongs here too: a concentrated stock stored cold may drop a precipitate, and the precipitate often contains the most important constituents of the solution, so it is warmed and redissolved rather than decanted off.

What is not in the formula, and why the absence is a decision. There is no second developing agent, no restrainer, no buffer beyond the carbonate itself and no wetting agent. Each absence is argued in The mechanism above; none of them is an omission from the source.

Interactions

Agent and alkali. Metol against a carbonate is not the pairing the fine-grain developers of the same years reached for. D-76 uses borax, D-23 adds no alkali at all beyond its own sulfite, and DK-20 uses a metaborate with a thiocyanate beside it. What makes carbonate workable here is the dilution: at stock-solution concentrations metol in a carbonate bath is energetic and fog-prone, and at 0.83 g/L in a bath that has to last ten minutes it is what the formula needs. Change the dilution and you change that relationship rather than merely the speed of the bath — which is why 1+1+8 and 1+1+10 come with different published time ranges instead of one table and a correction factor.

Agent and sulfite. Only one of the two interactions D-76’s page describes is live here. The sulfite protects the metol from aerial oxidation; it is not dissolving silver from the film. That separation is the formula’s design, and it is why this developer, uniquely in this reference, lets a reader see what sulfite does when it is only a preservative.

Agent and agent. None, because there is only one. The absence of superadditivity is not a gap in the formula, it is the compensating mechanism.

Restrainer and the film. The bath acquires its own restrainer as it works, and because it is dilute it acquires it fast and unevenly. This is the adjacency effect. It is also the reason agitation matters more here than in a tank of D-76: agitation is what redistributes the bromide, and redistributing the bromide is what destroys the effect. No source read for this page publishes an agitation scheme for this formula, which is a real gap on a developer whose behaviour depends on it.

Stock A and stock B, kept apart. The two-bottle construction is a keeping strategy before it is a convenience, and it is why Windisch can promise long life for the stocks and no life at all for the mixture. Mixing a litre of working solution and putting the surplus in a bottle undoes the whole arrangement.

With an acid stop bath. A carbonate developer carried into an acetic stop releases carbon dioxide, which is why a carbonate developer exhausts a stop bath faster than a borax one does; Part X works that through. At 4 g/L of carbonate the carry-over is modest, but the tank still holds more base than a D-76 tank does.

With the fixer, in either direction, as for any developer. One pair of tongs per tray.

Variants

The 1+1+8 printings are recorded above as a second combination rather than as a variant, because nothing has been reformulated: the same two stocks are mixed in a different proportion, and both proportions are published by sources of equal standing. What the reader has to do is choose one and record which.

The Encyclopedia of Photography’s monohydrated carbonate is the same formula weighed as a different salt. It is not a variant either, and it is a useful check on the others: two printings that agree through a hydrate conversion agree more convincingly than two that copy the same number.

Tetenal Neofin Blue and Neofin Red. Anchell and Troop record that Beutler formulated two well-known high-acutance developers in the 1950s which Tetenal still manufactured in 1998 as Neofin Blue and Neofin Red, Neofin Blue being optimised for medium and slow films and the more popular of the two. Sussman’s handbook adds that Beutler invented the developer first called Neodyn, renamed Neofin, and that the Tetenal plant made Neofin on his recommendations. Windisch, writing in 1956, describes the Neofin red and blue developers as a commercial developer of similar kind, sold as a highly concentrated liquid. Their compositions are not published by their maker and this course prints none. Haist, discussing developers built on low sulfite and a low metol concentration “such as was suggested by Beutler”, refers the reader to a table rather than stating the compositions in the text.

ADOX FX-39 is a current product whose datasheet states that it “is based on Willi Beutler’s Neofin Rot” and has been improved in every parameter. That is a manufacturer attributing a lineage to a product whose own composition is likewise undisclosed, and it is the reason this formula has a living descendant on the shelf.

Geoffrey Crawley’s FX-1, printed beside this formula in the same Annual section, is described there as “fundamentally a variant of the Beutler formula claiming better contrast control”. Anchell and Troop treat it as a highly evolved descendant. The Annual prints its quantities; this page does not reproduce them, because FX-1 is a formulary entry of its own and belongs to whoever writes it.

Altman and Henn’s AH-16, sold and discussed as “Beutler High Definition”, is discussed under Image characteristics above. Its authors call it similar to Beutler’s high-sharpness developer, not identical to it, and no source read for this page prints its composition.

Arthur Kramer’s modification, which Haist records, begins “to 150 mL of Beutler solution A (use only the A solution), 21.2 g of sodium sulfite and 8.5 g of…” — and the course’s reading of the passage stops there. A modification known only as far as its second ingredient is not a formula, so it is named here and not printed.

No course variant is offered. The formula already carries two published dilutions and an alkali control of its own, and a fourth way of mixing three chemicals would add nothing but a number to keep track of.

Safety

Level B, and one ingredient sets it. Metol is a skin sensitiser, and sensitisation is not reversible: a reaction acquired once is a reaction to every subsequent exposure. That is why D-23, which is metol and sulfite and nothing else, is also Level B. The classification rubric sets what the level assumes — splash goggles, ventilation better than a closed room, an eyewash within reach, and some experience of handling concentrated reagents.

The weighing is the hazardous part of the job, not the tank. Everything here is a dry powder before it is a solution, and 10 g of metol is a small enough quantity that people are tempted to weigh it casually. Weigh with extraction running or inside an enclosure, never in a draught, following the weighing SOP. Gloves stay on for the mixing and for the tray: metol is a sensitiser at any dilution.

Sodium carbonate is an eye irritant and an alkaline dust. Fifty grams is a large enough weight to raise a cloud if it is poured carelessly. It is not caustic soda — nothing here evolves the heat that makes sodium hydroxide dangerous to dissolve — but a carbonate dust in an eye is an alkaline injury rather than an irritation, so the splash goggles Level B assumes are worn for the weighing and not only for the tray. On its own the carbonate would not take this page past Level A; the metol does that, and the goggles are then already on.

What is not a hazard here. There is no hydroquinone, so the most heavily classified substance in an ordinary developer is absent from this one; there is no borax, so the reproductive-toxicity classification the D-76 page records for it is not in play here; there is no caustic alkali and no sulfide, so nothing in the formula evolves a gas at any stage of mixing or use, and the ventilation requirement is for dust while weighing rather than for vapour while developing. The working bath is a very dilute alkaline solution — about 9 grams of solids in a litre — and its hazard to skin is the metol in it, not its alkalinity.

Storage

Two bottles, filled full, tightly closed, labelled A and B. Windisch’s keeping statement applies to well-stoppered bottles and to nothing else. Follow the labelling SOP and put the letter, the strength and the date on each, because two clear colourless solutions that look identical and behave completely differently are exactly the pair that gets confused.

Small bottles rather than one large one. Kodak Limited’s advice for stock solutions is general and it applies with force to stock A, which has 50 g/L of sulfite standing between a metol solution and the air. Every time a large bottle is opened the air space above the liquid is refilled.

If a cold bottle has thrown a precipitate, warm it and redissolve it. The 1949 handbook’s warning is that the precipitate which separates in the cold often contains the most important constituents of the solution and should not be discarded.

The working solution is not stored at all. Mix what the tank holds, use it once, pour it away. No source publishes a keeping time for the mixture and the reason is that no source expects anyone to keep it.

Incompatibilities

Acid, in the developer. That is what the stop bath is for and it is why the tongs that went into the stop tray never go back into the developer. An acid splash in this bath does not merely neutralise some carbonate; it drops the pH out of the region where metol works, and there is no second agent and no large buffer reserve to hide the loss.

Fixer, in either direction. Thiosulfate carried back into a developer is an aggressive silver solvent — the very thing this formula exists to exclude — and will fog and stain. Developer carried into the fixer shortens its life and spoils a solution that would otherwise go for silver recovery.

Oxidising agents — ferricyanide, dichromate, permanganate, persulfate — must never meet a developing agent in a bottle or a drain. The incompatibilities page is the reference.

Acid and stock B, in the waste bottle. Sodium carbonate and any acid give carbon dioxide, briskly if the acid is concentrated. Pouring an acid stop bath into a bottle holding developer waste will foam.

Waste

Spent Beutler developer is a dilute alkaline solution whose environmental load is the metol and its oxidation products; the carbonate and the sulfite are the least of it. The bath is thrown away after one use, so a session generates more volume of it than a reusable developer would, and the concentration of everything in that volume is about a twelfth of a D-76 tank’s.

Keep it out of the fixer bottle. Developer carries almost no silver, and mixing the two spoils a solution that would otherwise go for silver recovery. Collect developer waste in its own labelled container and follow the general chemical waste SOP.

The disposal caveat governs. Local regulation decides, and this course cannot tell you what it says where you are.

Troubleshooting

Undissolved powder in the bottom of the stock A jug. The sulfite went in before the metol had fully dissolved. Metol is only slightly soluble in a sulfite solution without alkali, and stock A has no alkali in it by design. Warm the solution and stir; if it will not clear, the stock is short of metol by an unknown amount and is better remade than guessed at.

Thin negatives with empty shadows. Three candidates, in order of likelihood. The bath was reused — there is less than a gram of agent in a litre and it does not survive a second film. The dilution was 1+1+10 and the time was taken from the 1+1+8 table. Or solution B was made with a carbonate hydrate that was not the one weighed for: the monohydrate weighed as though it were anhydrous gives about 15 per cent less alkali.

Negatives dense and harsh, with blocked highlights. Too much alkali or too much time. The formula-specific control is Windisch’s: use less of solution B. The general control is the time, and the published ranges are wide — 7 to 10 minutes, or 8 to 15 — precisely because the source expects the worker to choose within them.

No visible edge effect, on a negative that is otherwise correct. Almost always agitation. The adjacency effect depends on the developer next to a dense area becoming locally exhausted and locally bromide-rich, and vigorous or continuous agitation sweeps both away. No source read for this page publishes an agitation scheme for this formula, which means the reader has to establish one and record it. Start from the scheme used for the last film in D-76 and reduce it.

Grain worse than expected. That is the published trade — “maximum sharpness at some loss of fine grain” — and it is worse on a fast film than on a slow one. The 1964 manual’s advice is not to use Beutler-type developers with the faster films at all.

A flat print from a negative that looked right. Anchell and Troop’s caution, arriving. Beutler-type developers compress tones, and a diffuse or cold-light enlarger head compresses them further. The diagnosis is made at the enlarger, not in the tank, and the answer is a higher contrast grade or a different developer for the next roll.

Stock A has gone amber. Aerial oxidation. Check the age of the sulfite — Windisch’s “purest quality” instruction is about exactly this — and whether the bottle has been standing half empty. Amber stock is not automatically dead, but on a formula with this little agent it should be tested on a strip before anything that matters.

Two bottles and no idea which is which. There is no test worth running here and no test that is safe to run on a bare hand: an unlabelled photographic solution is discarded, which is what the unlabelled container SOP says and why. The prevention is cheap — the letter, the strength and the date on each bottle as it is filled — and it is worth being strict about on this formula in particular, because the two stocks are both colourless, both nearly water-thin, and confusing them produces a metol solution with no preservative and a carbonate solution with no developing agent.

Experiments

Run the two published dilutions against each other. 1+1+10 and 1+1+8, matched strips from one exposure batch, each at the middle of its own published time range. The stock quantities are identical and the sources disagree only about how much water goes with them. If the negatives match, the difference is absorbed by the time ranges and it never mattered; if they do not, one of the two printings is the one you should be following, and nobody has said which.

Put the sulfite back, a step at a time. Make stock A at 50, 100 and 200 g/L of sulfite, keeping the metol at 10 g/L, and develop matched strips at the same dilution and time. You are testing Beutler’s own finding as Haist states it — that a high concentration of a silver halide solvent gives unsharp negatives with a loss of fine shadow detail — and the prediction is that grain smooths and edges soften together, with the shadows going first. This is the solvent series run from the other end.

Walk solution B. Windisch says a medium-speed film needs a lesser quantity of solution B and does not say how much less. Mix working baths at 1+1+10, 1+0.7+10.3 and 1+0.5+10.5 — the same agent, less alkali, the same total volume — and develop identical strips of a 100 ASA film to the same time. That is one published instruction turned into a measured answer, and it is a genuinely open question rather than a rehearsal.

Agitate three ways. The same bath, the same time, with continuous agitation, with five seconds every thirty, and with one inversion a minute. The adjacency effect is a diffusion phenomenon and agitation is the variable that controls it directly. Record the result on the developer laboratory report; a published agitation scheme for this formula is the largest single gap in its documentation.

Set it against D-76 at matched contrast. Two rolls of the same slow film, one in D-76 at Kodak’s published time and one here, developed until the two negatives have the same density range rather than the same time. Print both at the same size. The measured resolving power may be very close; the question is whether the print looks sharper, and that is a judgement the reader has to make and record rather than one this page can make for them.