| 摘要 |
Photographic color images having extremely good light-fastness are formed by converting a silver halide image to an image of a salt of a heavy metal that complexes with an organic complexing agent to make a strongly colored diffusion-resistant complex more light-fast than color coupler dyes. The heavy metal can be copper, chromium, manganese, iron, cobalt, nickel, palladium or platinum, or the like, and the organic complexing agent can have two different locations in its molecule for coordination with the metal. The silver halide is converted to the salt of the complexing heavy metal by applying to the silver halide image a differently colored or uncolored reactive complex of that metal having a disassociation constant larger than the corresponding complex of silver, so that the silver of the silver halide becomes bound by the reactive complex and liberates the heavy metal. It is also possible to go through two such reactive complex treatments to first convert the silver halide image to a mercury salt image, for example, and then convert the mercury salt image to an iron salt image, before the strongly colored light-fast final complex is formed. The organic complexing agent can be uniformly distributed in a light-sensitive silver halide emulsion, or it can be uniformly distributed in a layer adjacent that emulsion. After light-fast complex is formed, the unused complexing agent in such a layer can be complexed with a different metal ion to form a different color suitable for masking.
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