Planning the Capstone: The Project Plan and Its Hazard Assessment

Nothing in the capstone is weighed, cut, exposed or mixed until this document exists and has been read against the eleven requirements. That is not ceremony. A multi-week project with six chemical streams, three levels of hazard and a dozen fixed waits is the first thing in this course that cannot be recovered by being careful on the night, and the plan is where the recoverable decisions are made.

The deliverable is one document with nine parts. It is read once by you against the specification, and once by somebody else if you can find them, and then it is dated and does not change silently: every later revision gets a number, exactly as a formula version does.

Start from the picture, not from the equipment

Write two or three sentences saying what the body of work is about, before you decide what to build, what to mix or what to print on. Not a title and not a mood; a statement of subject and intention specific enough that it could rule an idea out.

“Six pictures of the tidal flats at the hour the water turns, made so that the exposure covers the turn itself rather than a moment inside it. The point is that the flats look different depending on how much of the tide the picture contains.”

That paragraph decides most of the technical plan on its own. It wants long exposures, so it wants a pinhole or a very small aperture and a material whose reciprocity behaviour you have fitted. It wants a long tonal scale in a bright, low-contrast subject, so it wants a lower contrast index than a default. It wants repeatability across a season, so it wants one batch of film and one batch of developer. None of that had to be argued about; it fell out of the intention.

The honest alternative is to say plainly that this capstone is a technical study, and let the subject follow the process:

“An investigation of what a stained developer does to a long-scale subject, printed on two papers. The subject is chosen to give the widest luminance range I can reliably find, and the pictures are in service of the comparison.”

Both are legitimate and the rubric assesses both. What is not legitimate is leaving it unstated and discovering at Stage 6 that the six prints have nothing to say to one another, which is the commonest way a technically competent capstone reaches band 1 on coherence.

Choosing the instrument against the picture

Four questions, answered as numbers where they can be:

What coverage does the subject need? An angle of view, from the framing you already know you want. That, with the format, fixes the focal distance, and the focal distance fixes the optimum pinhole diameter and therefore the effective f-number and therefore the exposure length.

How sharp does it need to be? Not “sharp”, but a blur you can state: a resolution at the print size and viewing distance you intend. Part VI’s optics pages turn that into a hole diameter and tell you whether the geometric blur or the diffraction limit is the one governing you.

What working distance and what exposure length? A subject that changes during the exposure — a tide, a crowd, weather — sets a ceiling on the exposure, and the ceiling combined with the f-number sets the film speed you need.

Which permitted build or modification delivers it? Read Stage 1’s menu against those three answers rather than against enthusiasm.

Then write the performance goal, and write it before the build starts, with a number in it and a measurement method beside it. “The corner illumination of the new back will be within 1.5 stops of the centre at the working focal distance, measured as a density difference on a uniformly lit sheet.” A goal invented afterwards cannot fail, and a requirement 1 that cannot fail is not satisfied.

Choosing the chemistry against the picture

One paragraph, and it argues from a characteristic rather than from a preference.

Name the developer characteristic the intended negatives need — speed, acutance, compensation, fine grain, stain — and say why the subject needs it. Then read the choice off two documents you already have: the comparison matrix rows you built in Part XXVII’s developer comparison, and the personal processing table from Part XV, which tells you what your own hands get from your own film.

“The flats are a low-contrast subject in flat light with a long luminance range at the water’s edge, so the negatives will be thin at the shadow end and I want separation there rather than acutance. My Part XXVII rows put D-76 at 1+1 highest of the four on shadow separation at a matched contrast index, and my processing table gives CI 0.58 at 11 minutes at 20 °C on this film. So D-76, mixed from raw chemicals, at 1+1, aimed at CI 0.55 for a longer subject range than the table was built on.”

Notice what that paragraph does not do. It does not claim D-76 is the best developer. It claims that your own measurements put it ahead on the one property this subject needs, and it names the two documents a reader could check.

The materials and consumables calculation

Five lines, each with an assumption written beside it.

Film or plates, with a redundancy factor. This is the line people underestimate, and the course declines to give you a multiplier — it has recorded no failure rate for any assignment, and a redundancy factor invented here would be exactly the kind of number this course refuses to print. What it gives you instead is better: your own. Part VII’s portfolio review sorts a season’s work into three piles — it worked, it worked but not as intended, it did not work — against the intention written before each exposure, and the ratio between pile one and the total is your hit rate. Use it. If eleven of thirty-six exposures went into pile one, you need something like three exposures for every finished work, and a six-work portfolio wants around twenty original negatives before you count brackets. If you did not keep those logs, say in the plan that the factor is a guess and what you based it on.

Paper, by size and box, for a campaign rather than a session. Work prints, test strips, the finished works, the remade-from-map print, the toned pair, and one unexposed control sheet per processing batch for the residual tests. Buy from one box where you can, and record the box code in the plan, because a change of paper batch mid-campaign is a change of material that will look like a change of technique.

Chemistry by the litre, from the formulation. Work out the volume from the sessions, not the other way round. One litre of D-76 stock at 1+1 one-shot in a two-reel tank is a known number of films; write the number and the tank volume down.

Alternative-process consumables at their real cost per sheet, which for the noble metals is an order of magnitude above everything else in the project and is the reason Stage 5’s cost band is higher than any other page’s.

Mounting and enclosure materials. Board, hinging, sleeves, a box. Plan them now rather than at the end, because the presentation format governs the print size and the borders, and a print trimmed for one format cannot be re-trimmed for another.

📓What the consumables calculator can and cannot do with a project of this shape

The calculator scales one documented session by a number of sessions, using the quantities a page’s own consumables table states unambiguously, divided by the priced pack and multiplied by the pack price. It reports the lower and upper dated estimates separately, and it leaves out every row with a range, an optional route, incompatible units or no usable pack price.

A capstone is not one session repeated. So run it once per stage page, with the session count you expect for that stage, and add the six results yourself. Three assumptions have to be stated with the answer, because the tool cannot infer them: how many sessions each stage takes for you; that stock and diluted working solution are not interchangeable quantities, so a row entered as concentrate cannot be compared with one entered as working bath; and that every omitted row is still a cost. A zero-priced omission is not free, and the calculator says so.

The schedule, and the waits that cannot be compressed

Build the schedule backwards from the finished portfolio, and put the fixed waits in first, because they are the only immovable things in it.

The immovable waits, with the figures they come from

1. 1Fibre-print washing, per batchILFORD's optimum permanence sequence: 1 minute's fixation at 1+4, a 5 minute first wash, 10 minutes in WASHAID at 1+4, a 5 minute final wash — 21 minutes. Where the print was selenium toned, the same maker's sequence puts WASHAID after the toner and the final wash at 30 minutes.
2. 2Resin-coated print washingA minimum of 30 seconds in vigorous fresh running water, or three trays of still water for 15 seconds each with agitation — and a warning not to over-wash, because water works in at the cut edge and swells the base.
3. 3Fibre-print drying and flatteningPart XIX runs its finishing lab as two sittings a day apart, because a fibre print takes hours to dry and cannot be flattened while it is damp.
4. 4Reading any print densityPart XV's paper-anchor convention reads a sheet 24 hours after it is dry to the touch. Set-consistency comparisons, dry-down and the toned-against-untoned measurement all wait that long.
5. 5Judging a toned printJudged dry, under the recorded light, beside its untoned control from the same session — so the same 24 hours applies, and the comparison cannot be brought forward by wanting it.
6. 6Coating and drying, if the project coatsA hand-coated sheet or plate dries to a condition rather than to a clock, and Part V fixes the conditions.
7. 7The subjectA season, a tide table, scaffolding coming down, a person who is only free on Thursdays. Write it in the schedule as a hard constraint, because it behaves like one.

Everything else in the project can be worked harder. These cannot, and a schedule that does not show them will fail in its last fortnight rather than its first.

And one sequencing constraint that is not a wait. The chemistry is formulated and verified before the negatives are exposed. Verified means the pH measured, a step wedge developed and read, and the result compared with your processing table — not merely mixed. A developer that turns out to give an unusable contrast index after the shooting is finished costs you the shooting, and there is no recovery from that inside a season.

The budget

Price every line from the planner’s dated shopping data, separate it into three columns, and state a total that a reader can check.

Below is a worked example for a minimum-compliant capstone — six works, one formulated developer, one toner, one alternative process, on resin-coated paper — assuming the laboratory of Parts II to XIX already exists. Every price is the price file’s own figure, checked 5 or 7 September 2026.

Must be bought	Quantity	Sourced price	Cost
35 mm film, one emulsion batch	4 rolls of 36	£6.37 to £11.40 a roll	£25.48 to £45.60
Variable-contrast RC paper, 8 × 10 in	50 sheets, as two 25-sheet packs	£33.50 for 25, or £96.18 for 100	£67.00 for 50; £96.18 for 100 at £0.96 a sheet
Raw chemicals for the developer	metol 50 g, hydroquinone 50 g, sodium sulfite 1 kg, borax 200 g	£16.20, £11.89, £13.68 to £19.98, £9.98	£51.75 to £58.05
Paper developer concentrate	500 mL to 1 L	£10.52 for 500 mL to £20.03 for 1 L	£10.52 to £20.03
Stop bath concentrate	500 mL	£10.66 to £12.18	£10.66 to £12.18
Rapid fixer concentrate	1 L	£21.05 to £25.98	£21.05 to £25.98
Wetting agent	1 L of concentrate	£28.70	£28.70
Pre-coated cyanotype paper, 8 × 10 in	one pack of 20 to 50 sheets	£18.95 to £36.95	£18.95 to £36.95
Silver nitrate for the residual test	one jar, 25 g at the lower figure and 10 g at the higher	£59.95 to £112.90	£59.95 to £112.90
Nitrile gloves	one box of 50 to 100	£6.64 to £14.99	£6.64 to £14.99
Conservation mount board, buffered and unbuffered	enough for six works	The price file could not price it. It is a gap the file names, with the buffered and unbuffered forms called out separately	—
Hinging tissue and starch paste, or corners	one pack	The price file could not price it	—
A portfolio box or presentation folder	one	The price file could not price it	—
Fibre-base paper, any size	—	£47.04 for 25 sheets to £150.28 for 100 at 8 × 10, glossy; the other surfaces and the larger sizes are unrecorded	—
A washing aid	1 L	£12.83 for a powder making 3.8 L of working bath, or £17.99 for 1 L of concentrate	£12.83 to £17.99 for one bottle
A toner of any kind	one bottle	£11.87 to £32.99 a bottle across sepia, selenium and gold	£11.87 to £32.99
Print and negative sleeving that passes the Photographic Activity Test	enough for the set	Named in the price file’s own gap list as unpriced	—

The priced rows come to about £325.40 to £502.54, and that figure is a floor and not a total: four of the seventeen lines have no sourced price — the board, the hinging, the box and the sleeving — and every one of the four is presentation material the finished portfolio needs. All four are gaps the price file names, which is worth noticing and is not the same thing as a price. Say so when you quote your own total.

Then split it three ways. Already owned — for most readers who have worked the course, that covers the gloves, the wetting agent, the silver nitrate from Part IV or Part XII, and often most of the raw chemicals, which reduces the new outlay by well over half. Must be bought — the film, the paper and the presentation materials, which are the rows that scale with the size of the portfolio. Could be substituted — the cyanotype pack replaced by coating your own; the toner route changed for a cheaper one; six works instead of ten. Write one sensitivity check beside the total: what does it become if your print failure rate doubles? For most plans the answer is dominated by paper, and it is worth knowing before you buy one pack rather than two.

The whole-project hazard assessment

This is the part no single lab page can give you, and it is the reason the plan is a deliverable rather than a paragraph. A page assesses a session. A project has substances sitting in the same cupboard for two months, streams meeting in the same waste corner, and sequences whose hazard is in the order rather than in any one step.

Use the format the course already teaches rather than inventing a second one: one row per substance, with the safety data sheet read and its version and date recorded, because a classification quoted from a sheet you cannot identify is not evidence.

Substance	Signal word and statements	Quantity actually handled	The control	Incompatible with	Storage
Metol	Warning; H302, H317, H373, H400, H410	2 g per litre, 6 g over the project	Weighed over a tray, gloves, no bare-skin contact, spills wiped up wet	Oxidisers	Dark, dry, labelled, with the date opened
Hydroquinone	Danger; H302, H317, H318, H341, H351, H400	5 g per litre, 15 g over the project	Splash goggles for the weighing, gloves, particulate mask where the sheet calls for one	Oxidisers	As above, and away from the acids
Sodium sulfite	Danger; H302, H314, H315, H319	100 g per litre, 300 g over the project	Gloves and eye protection; avoid raising dust	Acids — sulfur dioxide	Dry; sealed, because it oxidises in air
Borax	Danger; H319, H360	2 g per litre, 6 g over the project	Gloves; anyone pregnant or planning a pregnancy takes the substitution route	—	Labelled; the reproductive classification is the reason this is not a Level A material
Potassium bromide	Warning; H315, H319, H335	Only if the formula or a bleach needs it	Gloves, eye protection, no dust	—	Dry
Citric acid stop bath	Warning; H315, H319, H335	500 mL of concentrate over the project	Gloves; diluted into water	Sulfites, thiosulfates and sulfides	Away from every bath it must not meet
Rapid fixer (ammonium thiosulfate)	The product’s own sheet governs	1 L of concentrate	Gloves, eye protection, ventilation	Acids; sulfide toners	Its own shelf; retained spent for silver recovery
Silver nitrate	Danger; H272, H290, H314, H318, H360D, H400, H410	1 g, as 100 mL of 1 per cent solution	Splash goggles, gloves, apron; own dropper bottle, labelled and dated	Ammonia; alcohols; sulfides	Brown bottle, away from the working surfaces, away from children
The toner you chose	Its current sheet governs, and Stage 5 will not proceed without it	Per session	Extraction or an open window with a fan; goggles, gloves, apron	Acids — the stop bath and any acid fixer leave the room	Sealed; waste collected for licensed disposal

⚠The sequence hazards a page-by-page assessment cannot see

Four of these belong to the project rather than to any session, and they are the reason the assessment is done once, whole, at planning time.

An acid stop bath and a sulfide toner in one room. Each is unremarkable alone. Together they are the hydrogen sulfide pair, and the control is layout and scheduling rather than care: the acid baths leave the room, or are sealed and put away, before the toner bottle is opened. Plan which sessions can share an evening and which cannot.

Thiosulfate meeting acid in the waste corner. This is the likeliest incompatibility accident in a home darkroom, because the two liquids are adjacent in the tray sequence and adjacent again in the waste bottles. A capstone runs both for weeks. Label the containers before the first session, not after the first spill.

Sulfide in a room where photographic material is stored. Kodak’s own primer records that a very small quantity of hydrogen sulfide converts enough silver halide to sulfide to produce severe fog, and that no photographic material should be kept where sulfides are kept or sulfide toning is done. That is a hazard to the project rather than to you, and it is invisible until the box of paper you have been drawing on all season starts printing grey.

A silver nitrate bottle in a household. It is corrosive, it causes serious eye damage, it stains everything, and it will sit in your cupboard for the whole project because two stages need it. Assess the household, not the bench: who else opens that cupboard, and is the bottle labelled in a way they would understand.

The waste plan, written before the first bath is mixed

Four streams for a typical capstone, and each gets a labelled container and a route on the day it is created rather than the day it is full.

• Alkaline developer, spent, collected separately from everything acidic.
• Acidic stop bath, which is the stream that must never meet the sulfite, thiosulfate or sulfide containers.
• Silver-bearing fixer and its first rinses, retained for silver recovery, together with the silver nitrate test solution, its rinse and the tested strips.
• Toner and its first rinse, in a container of its own, for licensed disposal, and never in one that has held a stop bath or a fixing bath.

An alternative-process capstone adds a fifth: the clearing baths and first washes carry both metal and sensitiser and are collected rather than drained.

And write the caveat into the plan itself. This plan records a route, not a permission. Local regulation governs disposal in every jurisdiction, the course can describe chemistry and general practice and nothing more, and the disposal page explains exactly where the line falls. Check your local regulations; they govern.

Contingency, written in advance

Five failures worth planning for, each with a decision rule rather than a hope. The point of writing them now is that a rule made calmly in week one is better than one made at midnight in week six, and that a rule you wrote down can be followed by a tired person.

If	Then
The build misses its performance goal	Measure the shortfall, diagnose it, and choose between one iteration and carrying the limitation. Set the iteration budget now — one attempt, a stated number of evenings — because an open-ended rebuild eats the shooting season. Carrying a measured limitation into the negatives and accounting for it is a legitimate capstone outcome and scores better than a goal quietly revised
The formulated developer gives an unusable contrast index	Do not adjust the formula and reshoot. Adjust the development time first, from your own contrast-index-against-time slope, and only declare a variant if time cannot reach the target. A variant declared mid-project is a new version identifier and a new verification run
The emulsion or the coating fails	Fall back to bought material for the negatives and keep the coating work for the alternative-process print, where a failed sheet costs one sheet rather than a campaign
The weather or the season removes the subject	Name the substitute subject now, in the plan, and say what the substitution costs the intention. A substitute chosen in advance usually serves the statement; one chosen in a panic usually does not
A chemical cannot be obtained	Use the substitution table in the specification, take the stated cost, and declare it. Do not substitute silently and do not wait for a restock that may not come

Alternative route

Planning needs no facility at all — it is a table and a pencil. What needs planning differently is a capstone that will be executed without a darkroom, and three parts of this page change for it.

The schedule loses its longest wait and gains a shorter one. A project printed by contact under controlled room light and in an alternative process has no fibre-print enlarging campaign in it, so the 21-minute optimum-permanence sequence appears fewer times. What replaces it is drying: a coated alternative-process sheet has to dry before it is exposed, and that wait is on the critical path in a way a wash is not, because nothing else can be done to the sheet meanwhile. Build the schedule around coating batches rather than around printing sessions.

The budget shifts from paper to sensitiser. Strike the enlarging-paper line and add the alternative-process consumables at their real cost per sheet, which for the iron processes is comparable and for the noble metals is an order of magnitude higher. A pack of pre-coated cyanotype paper at £18.95 to £36.95 for 20 to 50 sheets is the cheapest complete route through requirement 10 that the price file can price, and it is a legitimate one.

The hazard assessment gains a row and loses none. Coating means handling sensitiser salts as powders and solutions, which is Level B weighing under the same controls as the developer row above, and it means a clearing bath and a first wash that carry both metal and sensitiser and are collected rather than drained. Nothing comes off the list, because the residual tests, the developer and the fixer are all still there.

And the declared substitution is written into the plan at this point, not at the end. Name the obstacle, the route, and the requirement it affects — requirement 8’s enlargement, which has no substitute — so that the trace table you build at the review gate shows the gap in the row where a reader would look for it.

Estimated consumables cost

This page consumes almost nothing, and it is worth saying so plainly rather than leaving the section out: the planning session is reading, arithmetic and writing.

Consumed	This session	Sourced price	Cost this session
Printed worksheets, the plan and the hazard assessment	6 to 10 sheets of ordinary paper	The price file does not price office paper. It is one of the bench and workshop consumables the file names as a gap	—
Notebook pages	2 to 4	Not priced	—

Nothing else is used up. Equipment used and not consumed: the safety data sheets you already hold, the consumables calculator and the planner, all of which cost nothing to run. The subtotal is therefore not a number at all, which is the honest answer for a session whose only consumable is paper — and every figure in the project budget above belongs to the stage pages that will actually spend it.

The review gate, and the records you open

The plan is finished when you have read it against the eleven requirements one at a time, and can point to the scheduled activity that satisfies each. Do it as a table, and expect two of them to be unsatisfied on the first pass; that is what the exercise is for.

Then, at that moment and not later, open four records so that the first entry predates the first action:

1. The lab notebook, with the plan’s date and version as its first entry.
2. The exposure log, headed with the camera, the format and the material, even though nothing has been exposed.
3. The formula version record, with the version identifier allocated by the versioning SOP — the code is written on the label before the bottle is filled, not after.
4. The hazard assessment itself, signed and dated, because it is the document you will revise when the toner choice changes and you want to be able to see that it changed.

▷What to submit for this assignment

• The project plan, one page, with all nine parts, dated and versioned.
• The requirement trace: eleven rows, each naming the scheduled activity that satisfies it and the evidence it will produce, with the requirement you are furthest from meeting marked.
• The whole-project hazard assessment, every classification cited to a safety data sheet with its version and date, and every incompatibility pair justified against the incompatibility matrix rather than against darkroom lore.
• The waste plan, four or five streams, each with its container, its label and its route.
• The consumables and budget sheet, with the assumptions stated, the unpriced rows named, and one sensitivity check.
• The schedule, with the fixed waits drawn in first and the sequencing constraint visible.
• The contingency table, five rows, each with a decision rule.
• One critique: exchange plans with another student if you can, and identify the one contingency that is missing. If you cannot, read your own plan a week later and ask which failure it does not cover. There is nearly always one, and it is nearly always in the supply chain.

Recap

The plan starts from a statement of what the pictures are about, and every technical choice after it is argued from that statement and from two documents you already own: your comparison-matrix rows and your personal processing table. The instrument is chosen against coverage, sharpness, working distance and exposure length, and its performance goal is written with a number in it before any work begins.

The materials calculation uses your own hit rate for redundancy rather than a factor this course would have had to invent, and the budget is priced from the dated shopping data with its unpriced rows named, which for a capstone means mount board, hinging, a box, fibre-base paper, a washing aid and a toner. The schedule is built backwards from the finished portfolio with the immovable waits placed first, and it obeys one sequencing rule: the chemistry is formulated and verified before the first exposure.

The hazard assessment is done once, whole, at project scale, because the hazards that a page-by-page assessment cannot see are the ones that come from two months of coexistence: an acid and a sulfide sharing a room, thiosulfate and acid sharing a waste corner, sulfide fogging the paper you are drawing on, and a corrosive bottle in a household. The waste plan records a route rather than a permission. And the contingency table is written while you are calm, because that is the only time it can be.

Check your understanding

Question 1. Why does this page refuse to give a redundancy factor for the number of negatives to expose, and what does it ask for instead?

• Because redundancy depends on the film, and the manufacturer publishes the figure
• Because the course has recorded no failure rate for any assignment, so a multiplier printed here would be invented; the page asks you to derive your own from the hit rate Part VII's portfolio review produces from your own logs
• Because redundancy is a matter of confidence and cannot be quantified at all
• Because a redundancy factor would make the budget unaffordable

Show the answer and why

Answer: Because the course has recorded no failure rate for any assignment, so a multiplier printed here would be invented; the page asks you to derive your own from the hit rate Part VII's portfolio review produces from your own logs

This is the same rule that governs the whole course: a number appears only if a source supports it or the reader measured it. No page in Parts VI or VII records what fraction of exposures survived, so there is no course figure to quote and inventing one would be worse than leaving the line blank. What does exist is a personal figure, and Part VII builds it as a by-product of sorting a season into three piles against the intention written before each exposure. A reader without those logs is asked to say in the plan that the factor is a guess and what it rests on, which keeps the assumption visible in the one document that will be read again.

Question 2. Your plan has the developer being mixed in week four, after the first fortnight of shooting, so that the weather can be used while it holds. What is wrong with that, and what is the rule?

• Nothing, provided the developer is mixed before the negatives are processed
• The film would age before development, which changes the latent image
• The chemistry must be formulated and verified before the first exposure of the campaign, because a developer that turns out to give an unusable contrast index after the shooting is finished costs you the shooting and there is no recovery inside a season
• Mixing a developer in week four means it will be past its shelf life by week ten

Show the answer and why

Answer: The chemistry must be formulated and verified before the first exposure of the campaign, because a developer that turns out to give an unusable contrast index after the shooting is finished costs you the shooting and there is no recovery inside a season

Verification is the load-bearing word. Mixing before processing satisfies the letter of requirement 5, but it leaves the contrast index of the whole campaign unknown until the negatives already exist. Verified means the pH measured, a step wedge developed and read on your own densitometer, and the result compared with your processing table — after which the development time can still be moved, or the formula declared a variant and re-verified, while the shooting has not yet happened. Latent-image keeping and shelf life are real considerations and belong in the plan, but neither is the reason for the sequencing rule.

Question 3. Which of these is a hazard that only a whole-project assessment can see, rather than one a single lab page would already catch?

• Hydroquinone is classified as a suspected carcinogen and needs goggles when weighed
• An acid stop bath and a sulfide toner living in the same room across a season, and the paper stock being fogged by traces of hydrogen sulfide
• Silver nitrate causes serious eye damage
• Spent fixer is silver-bearing and is retained for recovery

Show the answer and why

Answer: An acid stop bath and a sulfide toner living in the same room across a season, and the paper stock being fogged by traces of hydrogen sulfide

Three of the four are session hazards and every page that uses those substances already states them. The one that needs a project view is the coexistence hazard: two baths that are each unremarkable alone, kept in one room for weeks, adjacent in the tray sequence and again in the waste corner — plus a consequence that is not a hazard to a person at all. Kodak record that a very small quantity of hydrogen sulfide converts enough silver halide to sulfide to produce severe fog, so a season of sulfide toning in the room where the paper lives is a slow, invisible loss that no single session would ever be blamed for.

Question 4. The worked budget puts the priced rows at about £325 to £503 and then calls that a floor rather than a total. Why?

• Because prices rise, and the figures were checked in September 2026
• Because delivery is excluded from the price file
• Because four of the seventeen lines have no sourced price at all — mount board, hinging, a portfolio box and photographic-activity-tested sleeving — and every one of them is something the finished portfolio needs
• Because the calculator cannot pair a low pack price with a high pack size

Show the answer and why

Answer: Because four of the seventeen lines have no sourced price at all — mount board, hinging, a portfolio box and photographic-activity-tested sleeving — and every one of them is something the finished portfolio needs

A subtotal computed from a price file is only a total when the file could price everything the work uses, and here it could not. Four lines are unpriced, every one of them is a gap the register already names, and all four are presentation and permanence materials — which is to say, precisely the half of the project that the specification's requirement 11 rests on. A named gap is a recorded absence and not a figure, which is exactly why the subtotal stays a floor. The first two answers name real limitations that the price file states about itself, and the fourth is a genuine limitation of the calculator, but none of them is what makes this particular figure a floor.

Check my answersClear