Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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The gradual loss of color of a pigment or dye that is chemically unstable. Unstable dyes or pigments become colorless (or at least less highly colored) compounds when they undergo chemical reactions upon exposure to the ultraviolet radiations of natural light, and to the oxygen, moisture, and other elements of the atmosphere. Dyes and pigments subject to these reactions are generally referred to asFUGITIVE COLORS .

There is no known way of preventing the fading of unstable colors. (143 , 233 )

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