Paint Batch Colour Consistency: A Buyer Approval Checklist

Approve paint batch colour consistency against an agreed reference sample, using a documented comparison method and acceptance limits. Link the result to the production batch before shipment. A photograph can support the record, but should not be the only approval evidence.

This checklist is for importers and private-label buyers preparing a supplier discussion. It does not set a universal colour tolerance or certify a paint batch.

1. Agree on the reference

X-Rite explains that a production trial is compared with a standard, and that customer and supplier should agree acceptable colour limits. Identify the approved reference with a sample code and revision. Ask who holds it, how a replacement is approved and which revision applies to the order. Read X-Rite's guidance.

Before requesting a production sample, send a short brief: product family, colour reference, intended surface, finish and order reference. Keep these fields together so an attractive sample cannot accidentally be approved for the wrong specification.

2. Write down the comparison method

BYK describes colour and gloss specifications, recorded batch corrections and evaluation under different illuminants. Ask the supplier to identify the agreed method and viewing conditions, rather than sending a bare pass/fail statement. Read BYK's laboratory guidance.

For your approval sheet, include a space for sample preparation, comparison date, method, result and reviewer. If numerical data are supplied, ask what the reported value means and which agreed acceptance limit was used. Leave unagreed limits blank until both parties resolve them.

3. Connect approval to the shipped batch

Request a sample identifier alongside the production lot reference. Record the decision as approved, pending or rejected, with the reason and date. If a sample is corrected, require a new revision and an explicit decision; do not let an old approval silently cover a changed sample.

Keep the approval sheet with the purchase order and shipment documents. An internal review should answer three questions: which reference was used, which sample was reviewed, and which batch is being released?

4. Questions to send your supplier

• Which reference and revision will this order match?
• What comparison method and acceptance limits will appear in the report?
• How will sample changes be recorded and re-approved?
• Which lot identifier connects the accepted sample to shipment?

Frequently asked questions

Is there one acceptable colour-difference limit for every paint?

Use the limit agreed for the product and comparison method. This guide does not prescribe a universal value.

What should a buyer do if the evidence is incomplete?

Keep approval pending and request the missing reference, method or lot information before making a release decision.

For related sourcing information, explore HANHU colour solutions and the OEM manufacturer evaluation checklist.