The Coloration of Plastics

Abstract
Although plastics can be coloured by various techniques, in the main they are mass‐coloured with dyes or organic or inorganic pigments. Some of this colouring is done during manufacture, but a growing proportion is now carried out subsequently and even as late as when the plastic is being extruded or injection‐moulded into its final form. The way in which colorants are selected for use with plastics and the problems that beset the colourist in preparing economical colour formulations of good performance are discussed.

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