Lab Dip

What is lab dip? A lab dip (also called a color sample, shade sample, or dye sample) is a small piece of fabric dyed under controlled lab conditions to hit a target shade before bulk production. It is the color-approval checkpoint: both sides agree on the shade that will be reproduced at scale.

In Chinese trade talk the same step is 色样 / 批色 (see the Chinese lab-dip page when you need native wording).

Lab dip meaning for buyers

Lab dip meaning in sourcing is not “a product to resell”—you are approving a color standard. The approved dip becomes the reference for bulk shade. Without it, “match the Pantone” stays ambiguous across mills, lights, and base cloths.

Why lab dips exist

Bulk dyeing commits full lots, chemicals, energy, and lead time. Approving a lab dip first reduces the chance of rejecting an entire batch for shade. Skipping approval to “save a week” often costs more in rework or claims.

How the lab dip process works

1. Target — Pantone reference, physical swatch, or digital color file (state which light you will judge under).
2. Recipe — dye selection, concentrations, and process settings for the actual fiber and fabric construction (a dip on the wrong base cloth misleads).
3. Sample dye — typically a small mass of fabric under lab control; if the match fails, adjust and redip.
4. Evaluation — instrument reading plus visual check under standard light; check secondary lights for metamerism.
5. Approval — written sign-off of the accepted dip (and keep a retained sample).

Print programs use a related but different tool: a strike-off for the printed design, not only solid shade.

Color difference (Delta E) in commercial talk

Spectrophotometers report color difference as Delta E against the target. Many commercial programs treat roughly ≤1.0 as an excellent match and ≤1.5 as often acceptable—but critical end uses may set tighter limits. Treat these as common conversation points, not a universal law or a warranty from this page. Always write the tolerance, light source (e.g. D65), and measurement method into the order.

Visual assessment under standard light confirms the number. Checking multiple lights reveals metamerism (match under one light, diverge under another).

Lab dip submission (what to send)

A lab dip submission is the package the mill’s lab needs to produce a matchable dip. Include at minimum:

• Target type: Pantone code, physical swatch, or digital file (state which)
• Fiber, construction, and stage of the base cloth for bulk (greige vs PFD / dye-ready)
• Light sources for approval (e.g. D65) and any Delta E tolerance
• Number of colors, preferred dip size, and due date

Incomplete submissions slow the first round; wrong base cloth produces a dip that will not match bulk.

Practical sizes, timing, and fees

Lab dips are often around 10×10 cm to 20×20 cm. Suppliers may send several options per color so you can choose within the acceptable band. Turnaround is commonly discussed in the range of several working days to about two weeks, depending on lab load and complexity. Many mills charge per color and credit the fee against a following bulk order—confirm commercially.

Buyer approval checklist

• Target type documented (Pantone / swatch / file) and retained
• Dip run on the correct greige or PFD base for the bulk program
• Tolerance, light sources, and instrument method written down
• Metamerism checked for the product’s end-use lighting
• Approved sample labeled, sealed, and stored for production QC
• Bulk lot must match the approved dip, not an earlier reject

Industry practice is clear: approve lab dips before bulk, keep the approved sample as the production reference, and never let an unsigned shade “travel” into the dye house.

For solid-color programs after approval, see solid dyed fabric. For dye-ready bases, review PFD. To discuss a color program with a mill team, contact Weaverine.