Lab Dip Versus Strike-Off: When To Use Each Sample Type

Lab Dip A small dyed fabric or material sample submitted for color approval before bulk production. Lab dips and strike-offs are both pre-production color-control samples, but they serve different purposes and are used at different stages of development and production.

Choosing between a lab dip and a strike-off depends on whether you need a quick color check on the same substrate (lab dip) or a sample that reproduces full-scale production processes including print, pattern, or special finishes (strike-off). Misunderstanding the difference leads to wasted rounds of samples and delayed shipments.

Primary Differences

• Purpose: Lab dips verify shade on a base fabric; strike-offs validate technique applied to the fabric, such as screen print, piece-dye with special finishes, or discharge processes.
• Scale And Detail: Lab dips are small flat swatches focusing on color; strike-offs include actual patterns, repeats, or full-print runs to reveal interactions between color and print structure.
• Cost And Lead Time: Lab dips are inexpensive and fast; strike-offs cost more and take longer because they require setup that mimics production machinery and processes.

When To Use A Lab Dip

Use a lab dip when the primary concern is shade match on a given fiber and construction. Typical scenarios include solid-color garments, linings, or base fabrics where no print or specialty finishing will be applied. Lab dips are the first gate for color approval before ordering strike-offs or production samples.

When To Use A Strike-Off

Choose a strike-off when a repeat, print placement, specialized finish (glaze, enzyme wash, resin coat), or complex dyeing process may affect final appearance. Strike-offs are mandatory for patterned textiles, heat transfers, and when surface effects (sheen, crackle, hand) are critical to the design.

How They Fit Into Development Workflow

Typical workflow: the design team sets the target color → mill produces lab dips to confirm shades on the chosen substrate → buyer approves a lab dip shade → if print/finish is required the mill produces strike-offs incorporating the approved shade and finish → final pre-production sample confirms all factors before bulk runs.

What Teams Should Check On Each Sample

• Design/Merchandising (Lab Dip): Verify tone, depth, and brand fit under agreed lighting.
• Technical/QA (Lab Dip): Check ΔE values, recipe, and replicability notes.
• Design/Merchandising (Strike-Off): Confirm print registration, repeat matching, and surface effects.
• Production (Strike-Off): Validate machine setup, color migration risks, and finishing impacts.

Common Pitfalls And How To Avoid Them

Common mistakes include approving a lab dip and assuming a strike-off will match without accounting for how printing inks or finishes shift color. To avoid this, require a strike-off for any process that changes surface chemistry or uses different colorants (e.g., pigment vs reactive dyes).

Practical Example

A fashion brand approves a lab dip for a teal knit. Later, they request an all-over burnout print. The initial lab dip doesn’t predict how the printing inks alter perceived teal. Producing a strike-off that uses the approved dye recipe but also applies the exact printing ink and curing method reveals a 3ΔE shift; the strike-off is adjusted and re-approved before bulk production, preventing a full production mismatch.

Decision Checklist

• Is the item solid or printed?: Solid → lab dip. Printed/finished → strike-off (or both).
• Do finishes alter surface appearance?: Yes → strike-off required.
• Do you need fast approval?: Lab dip first, then strike-off for final verification.

In short, the Lab Dip is a targeted shade-check tool best for confirming color on a specific substrate, while a strike-off verifies full production effects like prints and finishes. Use the two samples in sequence to control risk and avoid costly rework in bulk production.