Colour in Production: Lab Dips, Pantone TCX and Getting Bulk to Match

Lab dips turn an approved colour into bulk fabric by giving the mill a physical target, a defined approval method and a record of the accepted result. They are the point at which a colour selected by design becomes a dyeing instruction that can be repeated at production scale.

It is a production decision. An open colour holds fabric booking, dyeing and cutting. That is why colour sits on the critical path for fabric. A clear brief matters before the first trial.

How does a lab dip approval work?

A lab dip is a small trial dyeing submitted on the intended fabric before bulk dyeing is committed. The mill receives the colour standard and fabric specification, makes one or more trial recipes, and submits the result for comparison. The buyer approves the dip, rejects it, or gives a directional comment such as lighter, less red or less saturated. The next submission responds to that single recorded decision.

The sample must be tied to the actual development route. A shade produced on a substitute cloth may be useful for an early discussion, yet it cannot settle how the colour will read on the final fibre, construction, weight or finish. The same dye recipe can behave differently on another base fabric. This is why colour work belongs within the wider garment sampling sequence, alongside fabric approval, fit and construction.

Two to four rounds are typical where the shade is new or technically demanding. A pale neutral may settle quickly. A deep, bright or complex tone may need more adjustment, especially when the target began as paper or a screen reference. The value of the rounds is not their number. Each round should narrow a documented gap between the standard and the submission.

Approval point	What is compared	Decision needed before the next step
Colour brief	Standard, fabric base, end use and viewing conditions	The mill can prepare a first trial on the correct route
First lab dip	Trial dyeing against the physical standard	Approve, reject or give one directional colour comment
Revised lab dip	Adjusted submission against the same standard	Confirm that the colour and tolerance are acceptable
Bulk reference	Approved dip, shade band and fabric details	Release the colour route for bulk dyeing

Keep the approved dip, standard and comments together. An email saying “approved” without the sample version, fabric code or date can create a dispute once several shades and submissions are in circulation. One reference sheet gives the buyer, mill and quality team the same answer when bulk is checked later.

Why does Pantone TCX not guarantee an exact bulk match?

A Pantone TCX reference gives the parties a named physical colour target; it does not remove the translation from that cotton reference to the chosen bulk fabric. The textile chip is a far stronger starting point than a screen value because it is dyed material that can be viewed and handled. It still has to be matched on the fabric that will become the garment.

Paper references, often supplied as TPG, and digital colour values are useful for choosing direction. They are not safe final approval standards for fabric. Surface texture, fibre content, yarn structure, optical brighteners and finishing all alter how light is reflected. A smooth synthetic fabric, a brushed cotton jersey and a crisp woven cloth can make a nominally identical shade appear unlike one another.

For a brand-owned colour, the strongest master is a retained dyed swatch made on the same approved base fabric. It avoids asking the mill to interpret a paper reference into a different textile surface. Where that does not exist, send the TCX chip, specify the final fabric clearly and approve the submission on that fabric. The fabric weight and construction are part of the colour decision, not background detail.

Starting reference	Best use	Limitation at bulk approval
TCX textile chip	Defining a physical target for textile colour	It is cotton and may not reflect like the final fabric
TPG paper reference	Early design direction and colour communication	Paper surface and print do not predict dyed cloth exactly
Screen colour or image	Initial visual discussion	Displays vary and emit light, so they cannot be a bulk standard
Brand-approved dyed swatch	Holding a repeatable master on the intended fabric	It must be identified, protected and available for every submission

The practical question for every standard is simple: can the mill and buyer place the same physical reference beside the submitted fabric? If they cannot, colour approval starts with interpretation. That interpretation creates extra rounds before the first dye recipe is even judged.

How should a colour match be assessed?

A colour match should be assessed visually under agreed light, supported by an instrumental reading where the programme uses one. The visual check establishes whether the submitted fabric looks right beside the standard. The reading gives a repeatable way to record difference and follow an adjustment from one submission to the next. Neither check replaces the other.

In a light booth, standard and lab dip are viewed side by side under a controlled illuminant, commonly D65 for daylight. The assessor should also view under any retail or warm-light condition relevant to the product. The comment needs direction, not just a verdict: darker, greener, too yellow, too dull or acceptable. That language tells the dyer what to correct.

A spectrophotometer measures reflected colour and can express the gap as Delta-E. A lower Delta-E indicates a closer numerical reading. The tolerance needs to be agreed for the shade, fabric and end use. A tolerance that is unrealistically tight for a deep colour can consume rounds with no useful benefit; one that is too broad leaves the bulk team making subjective calls later.

Check	What it answers	What to record
Visual comparison in the primary light	Does the submission look acceptable beside the standard?	Approval or a directional colour comment
Secondary-light comparison	Does the appearance change in another relevant light?	Any visible drift and whether it is acceptable
Instrumental reading	How far is the sample from the standard numerically?	Reading method, result and agreed tolerance
Colourfastness review	Can the approved shade perform through the intended use?	Required tests and the approved result

Colourfastness belongs in the same approval conversation. Washing, rubbing, light and perspiration can all matter depending on the garment and end use. Some shades are harder to achieve while also meeting the expected performance. Assessing the colour in isolation can produce a late choice between appearance and fastness. The mill test report guide explains how those results should be read with the fabric specification.

What is metamerism and why does it matter?

Metamerism is a colour match that appears acceptable under one light source and visibly different under another. It occurs when the standard and submission reflect light differently, even though they look alike under the first illuminant. A pair can pass in daylight and separate under warm retail lighting.

It matters most when colours meet on the garment. A body fabric and a collar, pocketing, binding or trim may look coordinated at approval, then appear to belong to different shades under a shop light. This is especially unwelcome where a buyer expects components to read as one continuous colour.

The control is straightforward: view the standard and all relevant components together under more than one agreed light before release. If a visible difference appears under a condition that matters to the product, record it and decide whether to revise the dye route, change a component or accept the effect. A single numerical reading cannot make that commercial decision on its own.

How do shade bands control bulk variation?

Shade bands set the acceptable visual range around the approved standard and help keep fabric that will be cut together visually consistent. One approved lab dip proves a dye direction. It does not mean every bulk roll will be indistinguishable, particularly across batches or when a programme is repeated.

A shade band commonly includes the approved target with lighter and darker limits that still pass. It gives the dyehouse, inspection team and cutting team a shared boundary. Bulk rolls can then be checked against the band and grouped so that pieces within one garment come from compatible fabric. The purpose is to prevent a front panel, sleeve and collar from showing noticeable shade variation.

Bulk control	What it prevents	Practical action
Approved shade band	A fresh judgement on every roll	Retain the target and agreed light and dark limits with the bulk file
Roll grouping	Mixed shades inside one garment	Keep compatible rolls together for cutting allocation
Lot identification	Loss of traceability when a variance appears	Record dye lot and roll references through inspection and cutting
Reorder comparison	A later delivery drifting from the established colour	Compare the new lot to the retained master and approved range

Lot-to-lot continuity should be discussed before a repeat order is placed, not after fabric arrives. A dyehouse may need the retained standard, an earlier approved cutting or a fresh confirmation of the desired range. If the product is colour-critical, state that continuity matters in the enquiry and retain the physical approval set in a condition that remains usable.

No shade band turns a vague target into consistency. It is a control around a decision already made. The clearer the original standard and approval record, the more useful the band becomes during inspection and cutting.

What should a buyer include in a colour brief?

A complete colour brief identifies the physical target, the exact base fabric, the lights used for approval, the tolerance and the intended use. It gives the mill enough information to make a meaningful first submission, then gives every reviewer the same basis for a decision.

Start with a labelled physical standard. State whether it is a TCX chip, a brand swatch or another retained master, and send it by a controlled route so it cannot be confused with an outdated colour. Name the fabric composition, construction, finish and weight expected for bulk. A colour approved on a development substitute should be marked as provisional until the final base is available.

Specify the primary light and any secondary light where the garment will be judged. If the programme uses a Delta-E tolerance, include the method and limit in the brief. Add the product end use, because a tone used in a matching set, a uniform or a garment with contrast components needs a different level of continuity from a one-off fashion colour.

Brief item	Why the mill needs it	Common avoidable gap
Physical standard and version	Establishes one target for every submission	A colour code is sent with no physical reference
Final fabric specification	Determines how the colour will read and take dye	The first dip is made on a convenient substitute fabric
Viewing conditions	Aligns the approval check with product reality	The sample is judged in office light only
Tolerance and shade-band expectation	Sets the boundary for approval and bulk sorting	Reviewers give subjective comments with no agreed limit
Component list	Flags body, trim and lining combinations to check together	Pieces are approved separately and clash in the finished garment
Comment deadline and owner	Keeps the colour decision moving on the critical path	A sample waits while responsibility for feedback is unclear

Keep feedback concise and consolidated. One comment sheet, one approved standard and one named decision-maker prevent the mill from trying to reconcile conflicting messages. If a sample is rejected, say what moved from the target and whether the next dip should be lighter, darker, warmer, cooler, cleaner or less saturated. “Please match better” does not identify the correction.

Approve promptly once the required people have reviewed the same sample. A held lab dip holds its place on the fabric critical path. Speed is useful only when the decision is clear enough to release the next step with confidence.

Short FAQ

What is the difference between a lab dip and a strike-off?

A lab dip is a small dye trial on fabric. A strike-off usually refers to a trial of a print, though teams sometimes use the terms loosely. Confirm whether the submission tests dyed ground colour, printed artwork or both before approving it.

How many lab dip rounds should a buyer expect?

Typically two to four rounds for a new shade. The number depends on the standard, fibre, fabric construction, colour depth and clarity of the feedback. A clear physical standard and a specific comment often remove an unnecessary round.

Can a Pantone number be the only colour approval reference?

No. It can identify the intended shade, but the final approval should be a physical submission on the specified bulk fabric. Keep the approved dip with the Pantone reference and the written approval record.

Should colourfastness be approved after the lab dip?

No. Review the shade and required colourfastness together before bulk release. This exposes an issue while there is still scope to adjust the dye route or confirm an acceptable performance outcome.

The colour decision that protects bulk

Colour becomes manageable when the buyer turns preference into a controlled reference. Use a physical standard, approve on the actual base fabric, state the viewing conditions and record the accepted tolerance. Then retain the approved dip and shade band for bulk inspection, cutting allocation and repeats.

The judgement is plain: do not release colour on a screen image or a vague approval email. A documented physical standard and a disciplined lab-dip process protect the garment long after the first sample has left the table.