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Plastics are described which contain, in intimate contact with the pigments, boric acid in a quantity of 1 to 20% by weight, preferably 2 to 15% by weight, of the dry pigment. Also described is the process for producing said plastics, in which the usual plastic granules or powders are mixed with the above-mentioned quantities of boric acid before, during or after addition of the pigment, and the boric acid is brought into intimate contact with the pigment before further processing, of the particulate plastic is mixed with the pigment containing the above mentioned quantities of boric acid before being subjected to further processing under thermal stress.