Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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An accelerated aging testing device which exposes samples of colored materials or coatings to a carbon arc to determine their resistance to fading. The arc emits an intense actinic light which in a matter of hours approximates the destructive effect of a much longer period of ordinary daylight. Although it does not exactly duplicate the effect of prolonged exposure to natural light, it is still an effective indicator of the degree of light stability that can be expected of a material, and of the comparative resistance to fading of a number of samples. See also: ACCELERATED AGING TEST . (72 , 233 )

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