• Identify the reference sample and target colour.
• Record raw material, formulation, batch and process conditions.
• Change one variable and keep comparison conditions constant.
• Assess colour and application acceptance criteria separately.

Record field	Trial information
Date
Application / product
Polymer / raw-material grade
Raw-material batch
Colour reference / sample code
Masterbatch code / batch
Dosage and calculation basis
Formulation / blend ratio
Process / temperature / residence time
Sample thickness / measurement conditions
Single parameter changed
Observation / result
Acceptance criterion and reviewer