FIELD: development of dyes stable to effect of light. SUBSTANCE: invention refers to precolors which can be used in printing to produce photographic pictures, in security systems, etc. Formula of invention describes composition of precolor containing molecule of precolor which includes dye covalently bounded to radiation transsorbent formed from sensitizer selective for wave length and covalently coupled to photo-reactor generating reactivity of molecule. Molecule of precolor is colorless and forms color when treated with radiation. EFFECT: achievement of stability of color to effect of light. 25 cl
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