How Does the Lab Dip Approval Process Work?
598 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.
What Each Stage of Lab Dip Approval Decides
| Stage | What it settles | What happens if it is skipped |
|---|---|---|
| Reference setting | The standard the colour is judged against | Every later batch is judged against a different target |
| Dip submission | The shade a dye lot can actually reach | A target that no production lot can hit |
| Acceptance criteria | The band inside which the shade is approved | Repeated rejections over a difference inside tolerance |
| Signed approval | The record a production run is matched to | Later disputes with nothing to compare against |
A lab dip is a small dyed sample submitted for approval before a bulk run, so the process exists to fix a colour target that production can actually reach. A dip answers a colour question only, and color fastness on the production fabric is checked as a separate property. Setting the reference and the acceptance band before the dip arrives is what turns an opinion into a decision the floor can act on.
Limitations: Where Colour Approval Cannot Be Exact
Colour varies with the fabric lot and the dye bath, so a band rather than a point is the realistic target. The published position is that shade differences from fabric batch, ink variation and screen display are normal, and a difference inside that band is documented behaviour rather than a defect.
Judging conditions are the second limit. The same dip reads differently under different light and against different backgrounds, and a screen renders emitted light while fabric reflects it. Approving on a monitor alone leaves the reference open, which is why a physical reference is the one a run gets matched to.
Frequently Asked Questions About Lab Dips
Why approve a dip instead of a digital file?
Because a screen emits light while fabric reflects it, and the dye behaves differently on each fibre. A physical dip is the only version of the colour that production can be matched against.
How close should an approved dip be to the target?
Close enough to sit inside the acceptance band agreed up front. Approving without a stated band means every later batch is judged by eye against a moving standard.
Does an approved dip guarantee the production run matches?
It sets the reference, not a guarantee. Fabric lots and dye baths vary slightly between runs, which is exactly why the band exists rather than a single fixed value.
What happens if a later batch falls outside the band?
That is the case the approval record is for, because a signed reference makes the comparison objective. A difference inside the band is normal, and one outside it is what the process is designed to catch.
Our quality team approves lab dips against a physical reference and a stated band, because the shade a screen shows and the shade a dyed fabric holds are not the same measure.
Related Articles
- Embroidery Thread and Colour Standards
- Reducing Print Defects in POD Production
- Choosing Between POD and Bulk Inventory
Key Takeaways
- A lab dip is a small piece of fabric dyed to a target colour and sent for approval before bulk production .
- Where Lab Dip Approval Goes Wrong Approving a lab dip that cannot be repeated is the first failure.
- Review happens twice if the first lab dip is close but not exact.
- 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.
