fast colors
Those colors which are resistant to the action of
external influences, such as light, acids,
alkalies, etc. In textile dyeing and other
industrial processes, fast colors are those which
will satisfactorily resist fading for the useful
life of the product in which they are used. In
book cloths, the term refers to nonfading over
long exposure to artificial light,- but not to
natural light. Also called "lightfast," and,
inappropriately, "sunfast." See also: FADING ; FUGITIVE COLORS . (17 , 143 , 233 )
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