I am working on matching a number of colours for plastic production. How do I convert my CIELAB values to colour pigments for production?

There is an entire field known as colorant formulation that addresses the question you have asked. Essentially colorant formulation software takes the desired CIELAB values (or spectral reflectance curve) for your standard and uses information about your available pigments and mixing system to predict the required pigment amounts to formulate a match. Companies that sell spectrophotometers typically also sell color formulation software.

You might check with companies such as Hunterlab, BYK-Gardner, Datacolor International, GretagMacbeth, etc. to learn about their products. You might also look at Berns' book, Principles of Color Technology to learn more about the process. More.

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