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(1) A term applied in the dyeing industry to certain organic compounds that in combination with some other organic compound already deposited upon the fiber will develop a colored compound, or if united with a dye already upon the fiber will form a new coloring matter possessing a more desirable or faster color.(2) A substance used in photography to convert a latent image to a visible one by chemical reduction of a silver compound to metallic silver more rapidly in the portions exposed to light than in those not exposed. Such reducing agents as hydroquinone, pyrogallol, and p-phenylenediamine are used.See Photographic Chemistry.