Colour Approval Workflow: Lab Dips, Bulk Dips and Production Shade
Approval of a colour is a sequence of checkpoints, and treating a lab dip as final approval is a common and costly mistake.
The practical guidance below is written for buyers and product developers who need a specification that a mill can meet.
The approval sequence
Lab dip on the production substrate, then bulk dyeing trial, then shade verification on production batches.
Well-handled, this becomes a selling point that customers can actually perceive rather than a technical footnote.
Substrate consistency
A dip made on a different fabric or yarn lot cannot fully predict bulk colour on the actual production substrate.
Include the requirement in the purchase order, because that is the document both parties rely on commercially.
- Ask for a separate price line for the requirement
- Confirm minimum quantities before committing the colourway
- Build one extra approval round into the calendar
Light source evaluation
Shades are assessed under D65, TL84 and cool white, because approval in one light alone is unreliable.
Where several lines produce the same style, align settings across lines before the order starts.
Documentation of approvals
Approved dips are retained as physical standards with the recipe, machine and substrate recorded.
Track results over several seasons, because a slow drift is easier to correct than a sudden failure.
- Confirm the numeric range and the test method in the specification
- Keep an approved physical standard at the machine
- Retest after the agreed care regime before shipping
Production shade control
Batch results are measured instrumentally and compared against tolerance bands, with sorting rules defined in advance.
Plan the calendar with the approval steps in mind, since late approvals delay production regardless of capacity.
Summary
A clear specification, a trained operator and a documented test together remove most of the risk from this part of the programme.
