A lab dip is a small fabric swatch dyed in the laboratory to match the colour the customer wants. The process: the customer sends a target (a physical sample or a Pantone code), the lab prepares one or more variants (usually A, B, C), and the customer picks and approves one. Production dyeing only starts after approval.
The time depends on the dyehouse and the number of rounds, but customer approval is often the slowest step. Approve under standard light, not on screen, and keep the approved swatch, signed and dated, as the reference for the production lot.
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