Short-wavelength rays of light—such as ultraviolet light—responsible for the chemical reactions that take place in and cure photosensitive materials, such as photographic printing plate coatings, photographic emulsions, plastic films, and radiation-cured inks. Actinic rays are commonly produced by arc lamps, photographic flood bulbs, mercury vapor lamps, etc. Actinic rays are also known as Actinic Light. (See Photopolymer, Photopolymer Plate, and Ultraviolet Curing Ink.)
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