Color Approval and Sample Board Standard

Purpose

Color arguments are never really about color, they are about what the two sides are comparing. The customer is comparing the wall to a printed chip, a phone photo or a memory; the shop is comparing it to a tint formula on a receipt. Neither one is the coating. This SOP makes the approved color a physical object built from the job's own system, signed and retained, so a complaint in month six has an arbiter instead of two recollections.

Scope

Interior and exterior repaint, cabinet and trim work where a color is selected or matched: building the approval board, approving it, checking delivered material against it, and verifying the finished surface against it at closeout.

Not covered: choosing candidate colors and running the in-home consultation, which the color consultation SOP owns; what to do once a delivered color is confirmed wrong, which the tint versus reformulate versus repaint matrix owns; film thickness, owned by the film build SOP.

Roles and responsibilities

Procedure

1. Build the board out of the job's own system, on the job's substrate. Prime and apply two topcoats of the exact product, sheen and base being sold, with the applicator the wall will get, on the same substrate or a primed panel matching its texture, and make two: one for the customer, one retained. A shop default of at least 12 by 16 inches keeps the eye off the edges. Acceptance: both boards opaque with no thin edges, dried to the sheet's cure time before anyone judges sheen, and the back of each carrying eight fields: date, color name and code, base and colorant formula, product line and sheen, substrate and primer, applicator and number of coats, lot number, and the initials of whoever made it. Wrong, and the stop rule: a printed chip, a store card or one coat over raw board reads lighter and flatter than the finished wall, so no board means no approval and nothing is ordered. Hazard: spraying a board is an aerosol inhalation route wherever it happens, including a van with the doors open, so it is done outdoors or under ventilation with a respirator only under a written program per 29 CFR 1910.134, and on solvent-borne product bond and ground and keep ignition off per NFPA 33 in the edition your authority having jurisdiction has adopted. Matching by scraping existing coating on a pre-1978 building is a regulated renovation under 40 CFR 745 Subpart E, and debris outside the containment means the area is cleaned to that standard before anyone leaves.

2. View the cured board at the wall plane, in the room, under the light the room actually has. Tape it flat against the surface it represents rather than reading it in the hand or on a table, and look from about 3 feet, in daylight and again under the room's own lamps at the hour that room gets used. Acceptance: the customer has seen the board in both conditions on the surface it represents, with the room's lamp type on the ticket. Wrong, and the stop rule: two colors that match under one light and separate under another are metameric, which is what produces "it looked right in the store", so a board that shifts between viewings is not approved until the customer picks which condition governs and it is written down. Hazard: holding a board up a stairwell is ladder work under 29 CFR 1926.1053, and a board is a two-hand object, so it gets taped rather than held. If a lamp is swapped to view under a stated color temperature, kill the switch first and let a hot bulb cool, and the swap is restored and the fixture proved lit at step 6.

3. Sign the board itself, not just the form. The customer signs and dates the retained board, the second board goes home with them, and the ticket records which board is the standard. Acceptance: signature and date on the retained board, its eight back fields complete, and the same color name, code, base, formula and sheen copied onto the order. Wrong, and the stop rule: a signature on a form naming a color but no sheen is the callback where the customer picked flat and got semigloss, so an order missing sheen or base does not go in. Hazard: none, a desk step; the retention window and signed-form handling belong to the color consultation SOP.

4. Check every delivered container against the retained board's back label, and box multiple lots before use. Read each label for color code, base, product line, sheen and lot number, then combine containers of the same color into one vessel and stir, which is boxing. Acceptance: every container matching the board on code, base, line and sheen, and all lots for one continuous surface boxed into a single vessel labelled with both lot numbers before any of it reaches the wall. Wrong, and the stop rule: two lots run on adjoining walls show a hard line at the corner that no feathering hides, so an unboxed second lot does not go on, and a lot that cannot be matched goes back rather than onto the job. Hazard: pouring between pails splashes toward the face, so sealed eye protection goes on, and a splash is flushed for 15 minutes per the safety data sheet and then seen by a clinician. A full 5 gallon pail is a two-person or hand-truck lift. Pouring solvent-borne material generates static, so bond and ground the containers per NFPA 33 in the adopted edition, with vapor controlled as in step 1.

5. Draw down the delivered material and compare it to the retained board before the first wall coat. Pull a drawdown on the same substrate the board uses, dry it to the same state, and compare edge to edge against the retained board in diffuse daylight, following the visual comparison practice of ASTM D1729 in the edition your specification references. Acceptance: no difference visible at the wall plane, at about 3 feet, under the governing condition from step 2, to two people who did not mix the paint. Wrong, and the stop rule: a visible difference is not fixed by boxing it into the rest, which spreads the miss across the whole room, so that material goes back to be re-tinted to the retained board's formula and a fresh drawdown is compared first. Unstirred colorant reads different at the top of the pail than the bottom, so a failed drawdown gets a full remix and one re-test before it is called a bad lot. Hazard: drawdowns get pulled indoors because that is where the light is, so a solvent-borne product is drawn down under ventilation with the same respiratory control as step 1, and the wet card is set where nobody kneels or leans on it.

6. Compare the finished surface to the retained board at closeout, and restore anything the viewing disturbed. Hold the board against the finished surface in the condition step 2 named, on more than one wall, and walk it with the customer. Acceptance: no visible difference at 3 feet at the wall plane, on at least two walls including the one with the least light, plus every lamp swapped for viewing back in place and proved lit. Wrong, and the stop rule: a wall that reads right beside a window and wrong in the corner is usually film build rather than tint, so that room goes back through the film build SOP's readings before anyone reopens the color; a difference holding under both conditions is a color miss and goes to step 7. Hazard: reaching a board over a stair is the same ladder work as step 2, and a hot lamp being reinstalled is left to cool first.

7. Route a miss or a change through one path, and keep the board. A confirmed miss goes to the retint or repaint decision with the retained board in hand; a customer changing their mind after coating starts gets a written change order priced in labor and material before new color is ordered, and the new color gets its own board through steps 1 to 3. Acceptance: the disposition written on the ticket, a new signed board for any changed color, and the superseded board retained and marked superseded rather than thrown out. Wrong, and the stop rule: verbal approval of a change at the wall is the dispute nobody wins, so no changed color is sprayed until the change order is signed. Hazard: none, a desk step; the removal and re-prep for a repaint carry their own hazards under the prep and RRP SOPs.

The record this produces

The color file carries the retained signed board, the eight back-label fields, the governing viewing condition from step 2, the delivered lot numbers with the boxing note, the drawdown result including any failure and what was done about it, and the closeout comparison with the walls it was made on.

The office reads it when a customer calls in month six, because a board made from the job's own system settles in one visit what a formula on a receipt cannot. The estimator reads the drawdown failures, since a supplier whose lots miss repeatedly is a scheduling risk.

One filled-in run: great room repaint, one color, two coats

Wall area measured at 780 square feet, two coats, so 1,560 square feet to cover. At the sheet's practical 350 square feet per gallon that is 1,560 divided by 350, or 4.46 gallons, so 5 gallons are ordered. Two boards are built on primed drywall offcuts with the same primer and two brushed and rolled coats of the specified eggshell, eight back fields filled. Viewed at the wall plane in daylight and again under the room's own 2700 K lamps; the customer names the evening lamp condition as governing and it goes on the ticket, signed and dated on the retained board.

The store fills 3 gallons from one tint run and 2 more the next day, so two lot numbers arrive. Step 4 clears on labels: code, base, line and sheen match the board on all five containers.

Step 5 fails. The drawdown from the second lot reads visibly warmer than the retained board at 3 feet at the wall plane, under the governing evening condition and again in daylight, and both painters see it. A full remix and one re-test does not close it. Stop rule taken: that lot is not boxed into the first three, because boxing a visible miss spreads it across the whole room instead of confining it. The 2 gallons go back and are re-tinted to the retained board's formula. The replacement draws down with no visible difference under either condition, all 5 gallons are then boxed into one vessel labelled with both lot numbers, and the boxed material is drawn down once more and matched before the first cut-in.

At closeout the retained board is held against the window wall and the darkest corner wall, with no visible difference at 3 feet on either, and the 3000 K lamp swapped in for the daylight viewing is replaced with the customer's own and proved lit.

Self-check against the criteria as written. Step 4 acceptance is every container matching on code, base, line and sheen with all lots boxed: 5 of 5 matched on label, boxing completed at step 5 once the second lot was replaced. Step 5 acceptance is no difference visible at the wall plane under the governing condition: lot B visibly warmer, FAIL, stop rule taken, re-tint compared and PASS. Step 6 acceptance is two walls including the least lit: two walls compared, lamps restored and lit, PASS.

One exception this run did not hit: where a color is matched to an existing finish rather than picked, the retained board is still the standard, but the match is the supplier's instrument reading and its tolerance is theirs to state, so acceptance stays the visual comparison in step 5 rather than a number this shop did not measure.

References

• Product technical data sheet and container label for the exact product, sheen and base, for cure time before sheen and color are judged, and for practical coverage. Label directions govern where they differ.
• ASTM D1729, visual appraisal of colors and color differences of diffusely illuminated opaque materials, in the edition your specification references.
• 29 CFR 1910.134 for the written respirator program, 29 CFR 1926.1053 for ladders on construction work, 40 CFR 745 Subpart E for pre-1978 painted surfaces, and NFPA 33 in the adopted edition.
• See related: the color consultation SOP, which owns candidate selection and form retention; the tint versus reformulate versus repaint matrix; and the film build SOP.