Lab dips and strike-offs are early approval tools in textile development. They help buyers and suppliers confirm colour, print, coating, pattern, or surface direction before bulk production begins.

They do not remove every production risk, but they reduce guesswork. A small approval step before bulk can prevent expensive shade problems, print mistakes, coating issues, or misunderstanding between buyer and supplier.

Knowledge pill: Lab dips and strike-offs matter because they create a shared visual standard before bulk production. They help both buyer and supplier agree what should be produced.

What is a lab dip?

A lab dip is a small dyed sample made to match a target colour. It is usually prepared on the actual or similar fabric base.

Lab dips help approve:

  • Colour tone
  • Depth of shade
  • Brightness or dullness
  • Colour direction under light
  • Initial dye recipe direction

Buyers often receive several options, such as A, B, and C, and select the closest one or request adjustment.

What is a strike-off?

A strike-off is a small sample used to approve print, coating, embossing, pattern, or surface effect.

Strike-offs help confirm:

  • Print colour
  • Pattern scale
  • Registration
  • Coating appearance
  • Surface texture
  • Gloss or matt effect
  • Logo or graphic placement

Strike-offs are especially useful when the visual result depends on machinery, screen, roller, digital print setting, coating amount, or surface finish.

Why approval samples are important

Approval samples create a common reference. Without them, colour and surface judgments become subjective.

They help:

  • Reduce bulk production risk
  • Confirm buyer preference
  • Give the supplier a target
  • Document approval decisions
  • Support future claims or reorders
  • Speed up communication when adjustments are needed

For repeated orders, approved lab dips and strike-offs can become important historical records.

What lab dips cannot prove

Lab dips are useful, but they are limited.

They may not fully prove:

  • Bulk shade consistency
  • Roll-to-roll variation
  • Final hand feel
  • Shrinkage
  • Colour fastness
  • Production-scale dyeing behaviour
  • Finishing performance

A lab dip is mainly a colour direction approval. Bulk fabric should still be checked.

What strike-offs cannot prove

Strike-offs may not fully prove:

  • Full-width production consistency
  • Long-run print stability
  • Coating durability
  • Wash performance
  • Abrasion resistance
  • Final production yield
  • Exact bulk hand feel

For high-risk products, a strike-off may need to be followed by a trial roll or pre-production sample.

How to review lab dips

When reviewing lab dips:

  • Compare against the approved colour standard.
  • Use the agreed light source.
  • View fabric flat and folded if appearance changes by angle.
  • Mark approval clearly.
  • Keep one signed or dated approved standard.
  • State whether approval is for colour only.

Do not compare lab dips under random lighting if colour accuracy matters.

How to review strike-offs

When reviewing strike-offs:

  • Check pattern scale and direction.
  • Check colour placement.
  • Check surface evenness.
  • Check whether the base fabric affects appearance.
  • Confirm whether the result needs washing, curing, or finishing.
  • Ask whether bulk production will use the same process.

For coated or printed technical fabrics, visual approval should be supported by performance testing where needed.

Approval language matters

Use clear language:

  • Approved
  • Approved for colour only
  • Approved for print layout only
  • Approved with comments
  • Reject and resubmit
  • Proceed to pre-production sample

Clear approval language prevents the supplier from assuming more than the buyer intended.

Fast recall

Lab dips help approve colour. Strike-offs help approve print, coating, pattern, or surface effect. They matter because they create a shared standard before bulk production, but they should not replace bulk inspection or performance testing.