permanent pigment and color permanence

permanent pigment and color permanence
   Any pigment which can be expected to last or remain without essential change — little likely to deteriorate under certain atmospheric conditions, in normal light or in proximity to other colors. Color permanence refers to a pigment's lasting power. Tubes and other containers of paint are sometimes labeled with a code indicating a color's degree of permanence:

Glossary of Art Terms. 2014.

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