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Pigment red 57:1 for plastics The plastics industry uses P.R.57:1 primarily wherever performance in application is a minor concern, especially with respect to lightfastness. The exact value depends on the standard depth of shade and on the pigment concentration. P.R.57:1 is employed in cable insulations because of its good dielectrical properties. P.R.57:1 is employed in cable insulations because of its good dielectrical properties. P.R.57:1 is a useful colorant for a variety of special purpose media, including colored pencils and crayons.