The performance of organic pigments in plastics is reviewed briefly. Reference is also made to the newer inorganic pigments. Considerable progress has been made in developing pigments with greatly improved properties, but there are many gaps that need filling before the plastics technologist will have an adequate range of pigments available. A start has been made to develop pigments especially for the plastics industry, either by modifying the surface of the pigment crystals to render them more compatible with the polymer or by enveloping their discrete particles in a medium to prevent agglomeration, but much has still to be done.
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