Fabric Colour Approval: From Lab Dip Submission to Buyer Sign-Off

A fabric colour approval is a decision about a defined sample, target and viewing method. It is not simply an email saying that the shade looks good. The mill needs to know what the buyer accepted. The factory needs the same reference, and the buyer needs a clear record for bulk fabric checks.

The work begins before the first lab dip. Agree the colour target, fabric quality and finish. Set the review conditions and name the person who can approve the shade. Track each sample through the review. Carry the final decision into the production file so the next team can use it.

A lab dip is a small dyed sample used to develop and assess a colour match. Several options may be submitted for one target. Letters such as A, B and C identify those options. They do not mean first, second and third quality grades unless a specific system defines them that way.

This guide focuses on the merchandising work that connects the buyer and supplier. Dye formulation and colour measurement need their own technical methods. The merchandiser must make sure those methods, samples and decisions refer to the same product.

Establish one clear target for the match

Ask what serves as the colour standard. It may be a named physical standard, a buyer's fabric cutting, an approved previous sample or agreed digital colour data. Record its exact identity and version.

If the buyer gives a Pantone reference, preserve the complete code and any system or suffix information. A short colour name such as sage or ink is not enough to identify a shade across suppliers. Do not choose a similar-looking reference from a different system without agreement.

State which reference controls if two sources disagree. A physical cutting, an old approved lab dip and a colour shown on a screen may not give the same result. The buyer should resolve the target before the mill tries to match all three.

Check the condition of physical standards. A stained, faded or heavily handled swatch may no longer be a sound comparison. Protect the approved standard and identify any replacement. Tell the supplier which target is current so it does not use an older one by mistake.

A photograph can show which sample was sent. It should not silently become the colour standard. The camera, lighting, image processing and display all form part of what the viewer sees. Use an agreed colour workflow when a decision is to be made from digital evidence.

Define the fabric and finish as part of the request

Send the mill the actual fabric reference. State its fibre composition and construction, with the relevant finish details. Include the intended face and any direction that matters to appearance. A request for blue fabric leaves too many choices open.

The lab dip should represent the material being considered for the product. If the supplier uses a different base fabric, disclose the change. Ask which decisions that sample can support. Do not let an early colour discussion become approval of an untested fabric change.

Name the state in which the shade must be judged. Is it before finishing, after a specified finish or after a garment wash? The approval record needs that answer because the next process may affect appearance.

For a garment with several visible materials, list each one. The body fabric, rib, tape and lining may share a colour name while needing separate samples and technical routes. State whether they must match one master or achieve a particular appearance together.

Keep any agreed contrast intentional and documented. A trim may be designed to look darker than the body. Make that intent clear so reviewers do not keep rejecting it for failing to match exactly.

Map the combinations that need approval

Create a simple list of material-colour combinations before ordering samples. This prevents an approval for one fabric from being copied across another fabric with the same colour name.

Suppose a hypothetical style uses two colours, clay and pine, in both a body fabric and a rib. It has four colour-approval streams.

The references in this example are invented. Their purpose is to show that a colour name alone does not define the work. The material and intended relationship also matter.

If the buyer first approves the clay body, the clay rib remains open until its required review is complete. Do not mark the whole colourway approved because one cell in the list has passed.

Assign an owner and decision date to each stream. Link its sample, report and comments under that identity. One approval may cover several agreed uses. Record that scope and avoid extra tests that have no clear purpose.

Request the right form of colour evidence

A solid fabric lab dip, a printed strike-off and a yarn or knitted sample do not answer exactly the same questions. The submission should represent the product feature the buyer needs to judge.

A print review may need colour, repeat, scale and registration checks on the intended base. A solid dyed cutting cannot show those print details. A yarn colour may need review in an agreed knitted or woven form. The finished surface is part of the appearance the buyer needs to judge.

Follow the buyer's current sample form and size rules. The Talbots preproduction manual, for example, gives different submission forms. It calls for knitwear lab dips in knitted form. It also defines its colour-review route. These are buyer-specific instructions, not a universal sample size for every order.

Agree how many options and copies are needed. Three options can help the buyer compare clear alternatives. Each one needs a useful purpose and a clear identity. Sending poor swatches just to fill A, B and C positions does not help the review.

Ask the mill to explain any unresolved limitation before dispatch. If the intended finish is not available, say so. The reviewer needs to know that the shade has not yet been judged in its final state.

Review the submission before sending it onward

Check that the physical swatch matches its label and report. Confirm the material reference, colour target, submission round and option. A correct colour report attached to the wrong cutting creates a decision that cannot be used safely.

Inspect the sample's condition. Contamination, creases or an uneven dyed area can interfere with assessment. Do not crop out a visible problem and send only the best corner as though it represents the whole sample.

Check that the required internal review has taken place. If the mill already knows an option fails the agreed limit, explain why it is being submitted. The buyer may have asked to see the closest achievable result, but that purpose must be clear.

Keep technical findings separate from commercial urgency. A late order does not make a colour match better. It may lead the buyer to consider a defined concession, but only the authorised person can make that decision.

Retain a matched copy or another agreed record before sending the set. The supplier must be able to identify the exact option discussed after the buyer receives it.

Align the viewing conditions across the parties

Agree the light sources and viewing setup before the first round. A mill and buyer who use different conditions may reach different conclusions about the same pair of samples.

Datacolor's lighting guidance explains why a colour-temperature label alone is insufficient. Lights with the same stated temperature can have different spectral outputs. Use the specified source or agreed equivalent, not merely a lamp that looks like daylight.

The Talbots manual illustrates this need by naming a primary and a secondary light source. It asks suppliers to raise a problem when a match cannot be achieved under both. Another buyer may choose different conditions, so copy the order's actual requirements into the review brief.

Keep the viewing area suitable for the agreed method. Control background, nearby coloured objects and stray light. Present the target and sample in the required direction and arrangement. A directional surface can look different when one piece is turned relative to the other.

Check the light booth's maintenance status under the site's procedure. A label on a switch does not establish that the lamp and viewing setup are performing as intended. Report a fault before using the booth to settle a disputed approval.

Understand why one lighting match may not be enough

Two samples may appear to match under one light source and differ under another. This is illuminant metamerism, as explained in Datacolor's guide. It is a comparison between samples under changing light, not simply a new name for any colour difference.

Check whether the required materials still look right together under each agreed condition. A body fabric and rib may look close in the lab yet appear different under the buyer's other review light.

Record the result for each required condition. Do not write only “colour pass” if one condition passed and another failed. That shorthand hides the very issue the second light was meant to reveal.

If the buyer accepts a restricted match, record the exact concession and affected use. The record should not imply a broad match under all lights. It should also name the version and materials to which the concession applies.

Avoid promising that one approved lab dip will look identical in every possible environment. The team can assess and control the conditions in its agreed method. Those checks support a defined decision, not a promise about every possible setting.

Make instrument reports usable for the decision

When instrumental data is required, ask for the report tied to the actual submitted option. It should identify the target, sample, colour-difference method and relevant measurement conditions. A lone delta-E number is not a complete report.

The mill and buyer need compatible sample preparation and settings for the comparison. Datacolor's sample-measurement guide covers sample layers, backing and orientation. It also discusses aperture and other instrument settings. Changes in those factors can change the reported result.

The merchandiser does not need to invent the technical setup. The colour team should define it and resolve any differences between sites. Keep the agreed method with the evidence so the next reviewer knows how the number was produced.

Use the specified tolerance and decision rule. Do not borrow a limit from another buyer. One delta-E value is not an acceptance limit for every fabric. The metric and its conditions must be named before the value can support the intended decision.

Where the buyer requires both visual and instrumental acceptance, retain both results. A numerical pass does not remove a required visual review. An attractive swatch does not erase a failed required test either.

Compare options against all stated conditions

Consider an invented lab report for three options on one fabric. Assume the buyer has defined a colour-difference method and limits of 1.0 under condition 1 and 1.3 under condition 2. These values are teaching assumptions, not recommended industry tolerances.

Choosing the smallest first-column value would select A and ignore its failure in the second condition. Choosing the smallest second-column value would select C and create the opposite error.

B is the only option that meets both numerical limits in this example. Its remaining margins are 1.0 − 0.9 = 0.1 and 1.3 − 1.1 = 0.2. These figures are the differences from the stated limits. They do not measure instrument uncertainty or prove that future bulk fabric will be consistent.

The buyer still needs the other required checks before approval. If B uses the wrong fabric or fails the agreed visual review, it is not ready merely because both numbers pass. Record the reason and request the evidence or correction needed.

Do not average the two conditions to hide a failure. Each limit applies to its stated condition. A combined score has meaning only if the agreed method actually defines one.

Give every swatch a stable identity

Use an identifier that includes the stream, round and option. For example, BD-CL-R2-B can identify the clay body fabric, second round, option B. Keep that identifier on the swatch, report and comment record.

Do not reuse the same bare letter after a new round without also identifying the round. “Approve B” becomes ambiguous when there are several B samples in different envelopes. The approved object must be recoverable from the record.

Attach the label in a way that does not contaminate or obscure the area used for review. Follow the buyer's mounting rules. Leave enough usable sample for the required visual or instrument check. Do not assume a tiny cutting can support every method.

For the four-stream example, suppose the buyer requests three options and three matched sets per option. One set goes to the buyer, one stays with the mill and one stays with the garment team.

Swatches required = 4 streams × 3 options × 3 sets = 36 swatches.

That is a plan for this example only. Count any extra test pieces separately. Three matched copies of one option are still copies of that option, not three independent dye trials.

Send a submission pack that can be reviewed on receipt

The pack should state the decision requested and the date it is needed. Give the order or development reference and fabric identity. Add the colour target and option IDs, with any material or process difference clearly marked.

Attach the required reports and a short account of the last round. The reviewer should be able to see what changed without searching several email chains. Keep earlier comments available, but identify which ones still apply.

Check that physical and digital records agree before dispatch. If the report says round 2 while the mounted cutting says round 1, settle the mismatch at the source. Do not ask the buyer to infer which label is wrong.

Record the contents and tracking details for a physical shipment. Confirm that the colour team has received the actual pack. A courier delivery scan does not prove the reviewer has all the required information.

Where the buyer uses a portal, follow its submission route and status meanings. An uploaded file may be received, under review or approved. Keep those states distinct so receipt does not look like a finished approval.

Resolve a disputed result before changing the target

If the mill and buyer disagree, check the objects they reviewed. Both sides must assess the same option against the same standard. Compare the sample IDs, reference versions, finish state and review conditions. A disagreement caused by a wrong cutting will not be solved by another dye trial.

Ask each side to state its result in the agreed terms. A visual concern, a numerical failure and a missing report need different actions. Keep the evidence linked. The colour specialist can then see whether the findings conflict or concern separate issues.

If the technical team requests a fresh comparison, retain the disputed sample and identify the replacement. Do not remove the earlier result from the record. The final decision should explain which evidence controls and who resolved the issue.

A buyer may decide to change the target or grant a concession. Record that as a new decision with a clear scope. It must not look as though the original target was met when the requirement itself changed.

Record exactly what the approval permits

The decision should name the approved option, target, material, finish and scope. Include the approver, date, conditions and any action still required. A clear record can be brief without losing those details.

“Option B accepted for shade on fabric Q17 after finish F2” is more useful than “blue approved.” It ties the decision to a product state. The record must still say whether that decision permits bulk dyeing, sample use or another defined step.

Do not create permission from silence. A response may accept the appearance but ask for a further test. Clarify whether the next production step can proceed while that test is open. Keep the open condition visible until the authorised reviewer closes it.

Colour approval also differs from general fabric acceptance. AATCC's standards catalogue lists methods for laundering colourfastness. It also lists methods for crocking and other properties. A shade match does not demonstrate those properties.

Use the required current test or evaluation procedure. AATCC's 2026 manual announcement identifies EP9-2025 for visual assessment of textile colour differences. The procedure's name alone does not give the buyer's pass limit. The colour team still needs to follow the full method required for its review.

Turn rejection comments into a controlled next round

Ask for a clear correction direction tied to the target and sample. “Not good” tells the mill little. A comment may concern lightness, hue or chroma. State which option it refers to and the light under which the reviewer saw the problem.

Keep the buyer's technical comment intact when passing it to the dyehouse. If it is unclear, ask the colour specialist to explain it. Do not translate “less yellow” into a guessed change to the dye recipe. The dyer must decide the technical correction.

Give the next submission a new round identity and link it to the previous one. State what changed and what remained the same. A fabric or finish change should not be hidden among routine shade corrections.

If several rounds fail, review the target, material and method before asking for another blind attempt. The parties may be using different standards or viewing conditions. They may also need a technical feasibility discussion about the requested match.

Record any proposed concession separately from the normal correction route. Commercial staff can explain the timing or cost effects. The buyer's authorised team must decide whether to accept the changed shade.

Carry the approved reference into bulk control

Provide the mill and garment team with the same final decision and approved reference. Check that the retained copies actually match the accepted option. A handwritten approval applies to the identified swatch. It does not approve every similar cutting in the folder.

Link the approved lab dip to the first required bulk submission. A lab-scale match is evidence for development; bulk output still needs the checks specified for the order. Identify the bulk lot and finish so the comparison remains traceable.

The ApparelDiary guide to fabric-roll shade segregation covers shade differences in received fabric. Colour approval should give that work a clear reference. Bulk inspection and shade control then establish what the factory actually received.

A change to the fabric, dye route, finish or visible component needs review. Check its effect on the earlier approval. A repeated colour name does not establish that the changed product has been reviewed. Obtain the required confirmation before extending the approval to it.

Keep working copies protected from light, dirt and damage under the site's procedure. Separate superseded and current references clearly. When a standard is replaced, tell the affected parties which one controls future comparisons.

Close the decision loop across the order team

Maintain one current status record that shows open streams, pending evidence and approved uses. Link the swatches and reports through stable IDs. The ApparelDiary PLM guide explains how those product records can remain connected.

Review timing against the next activity that truly depends on the colour decision. Use the guide to usable supplier lead time when planning the path from approval through material supply. Approval date and usable-stock date are different events.

Before closing the stream, record the decision and resolve its conditions. Check that the required people have the current reference. The result is a shade standard for the next step, backed by evidence of what the buyer accepted and why.

References

• Talbots: Preproduction manual, colour and lab-dip requirements.

• Datacolor: light sources and colour evaluation.

• Datacolor: metamerism in colour matching.

• Datacolor: best practices for measuring colour samples.

• AATCC: standard test methods and procedures.

• AATCC: 2026 manual and revised evaluation procedures.