Colour Approval and Lab Dip Process
10 Customization & Manufacturing
A lab dip is a small piece of fabric dyed to a target colour and sent for approval before bulk production. Approving a lab dip locks the colour, so the strike-off you sign decides what arrives on the roll weeks later.
Skipping the step saves ten days and creates a season of arguments. Colour drift between dye lots is normal in textile production, and the only control a brand has is agreeing in advance what the acceptable result looks like.
What the Lab Dip Process Involves
The brand supplies a reference, usually a Pantone number, a physical swatch or a previous production piece. The mill dyes a small sample to match, then sends it back for review under a controlled light source.
Review happens twice if the first lab dip is close but not exact. Mills adjust the formula and submit a second round, and most programmes allow two rounds before the deadline becomes a problem. Build that time into the calendar rather than discovering it.
Approval then triggers bulk dyeing, and the approved lab dip becomes the contractual reference. When a delivery is disputed later, the conversation returns to that piece of fabric rather than to a description of the colour.
Judge the Dip Under the Right Light
Colour shifts with the light source. A sample that matches under daylight can read differently under a shop lamp, and two pieces that look identical indoors can diverge outdoors. Evaluate under a standard light booth where possible, or at least in daylight rather than under office lighting.
Check the substrate as well. A lab dip on a different fabric from the production roll tells you little, because fibre, weave and finish all change how dye reads. Approving a dip on the wrong base is a common cause of disputes that nobody can explain afterwards.
Look at the actual piece rather than a photograph. Screens vary, files compress, and a picture of a lab dip carries less information than the fabric itself. Where a physical sample cannot be posted quickly, at least compare it against a retained piece from the same supply chain.
Set Acceptance Criteria Before the Lab Dip Arrives
Decide the tolerance in advance. A measurable difference, expressed as a colour difference value against the reference, gives both parties a number to work with and removes the argument about whether something is close enough.
Say which attributes are critical. Colour, hand feel, and any finish such as water repellency or brushing each need a verdict, because a lab dip that matches in colour and differs in touch is still a problem on a premium garment.
Record who approves and by when. An approval waiting on a decision costs the same as one in the dye house, and the delay moves the production date. Name one approver and give them a deadline that leaves room for a second round.
Connect Approval to Production Planning
Build the approval window into the timeline before confirming a launch date. A custom programme that needs two rounds plus shipping can take three weeks, and every stage sits before anything is cut.
Then decide how much colour variation the range can carry. Multi-piece collections often need several colours approved in the same window, and submitting them together keeps the palette coherent instead of approving shades in isolation.
Keep the approved reference accessible to production and to customer service. When a buyer asks why a reorder is slightly deeper than the original, the approved lab dip and the tolerance notes answer the question without a factory investigation. The wider discipline around that documentation appears in Fabric dyeing and color matching in production.
Where Lab Dip Approval Goes Wrong
Approving a lab dip that cannot be repeated is the first failure. A shade achieved in a small dye bath is not always achievable in bulk, so ask the mill to confirm the lab dip is reproducible at production volume before you sign it off.
Approving without a retained copy is the second. Keep the signed piece and a photograph with the date, the dye reference and the light source used. Without it, a dispute becomes a memory test and the mill's position is as reasonable as yours.
Treating approval as a formality is the third. A lab dip signed off in a hurry becomes the standard for the whole run, and the next three months of complaints trace back to that thirty-second decision.
Standards Around the Lab Dip Process
Measurement makes approval repeatable. Instrumental readings remove some of the subjectivity, and the controls behind them are set out in Color management for print on demand production. Printed pieces need their own reference alongside the fabric one, since print colour and dyed colour move on separate curves.
Material origin affects the result as well. Recycled fibre varies more between batches than virgin polymer, so a lab dip approved on recycled stock should record which delivery it came from. The reasons are covered in Recycled polyester supply and quality explained.
Fit the approval step into the wider sampling sequence so nothing runs in parallel by accident. Fabric approval, garment sample and print strike-off each need a turn, and the order they happen in is described in Sampling process for custom apparel orders.
Decide whether the programme runs on production or on stock, because the lab dip requirement changes. A stock-based model needs fewer approvals than cut and sew, and Print on demand vs dropshipping: which model fits? sets out where approval sits in each. Treat the lab dip process as the control that makes a colour promise keepable, and start your custom order today with an approved reference on file.
