Fugitive pigments
Fugitive pigments, in painting, are non-permanent pigments (pigments that lighten in what is understood, said or defined to be a relatively short time when exposed to light).
While most paintings are supposed to be done with permanent pigments, painters have made work wholly or partially with fugitive pigments for a number of reasons: ignorance as to the permanence of the pigments, prioritising the appearance of the colours one can get with fugitive pigments over permanence, or the desire to have a painting change in appearance over time.
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