| 摘要 |
A method of photographic trichromatic printing comprises the steps of A. applying to the substrate a photosensitive emulsion comprising (a) a binder; (b) three types of grains of semiconductor oxides dispersed in the binder, each adapted to desorb OH- ions under the action of a primary color radiation; and either (c) a diazo system comprising a diazonium salt and three couplers each being adsorbed onto, or dispersed in the immediate vicinity of, one of said three types of grain; or (d) a diazo system comprising a coupler and three diazonium salts each being adsorbed onto, or dispersed in the immediate vicinity of, one of said three types of grain; B. exposure, C. development by heating; and D. decomposition of unreacted diazonium salts by exposure to UV light, to fix the image. An emulsion so produced and substrates carrying such an emulsion are also produced.
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