| 摘要 |
Photographic products and processes for the imagewise generation of a dye from a color shifted dye precursor of a preformed image dye, said precursor having at least one <IMAGE> group, wherein R is hydrogen, alkyl, provided that the alpha -carbon does not have a hydrogen atom attached thereto, aryl such as phenyl or substituted phenyl, e.g. p-nitrophenyl, or heterocyclic such as pyridine; R1-R6 are hydrogen, alkyl, preferably having from 1 to 6 carbon atoms, or aryl; n is 0 or 1; and T is a moiety containing a thiazolidin-2-yl group which upon silver-assisted cleavage of said thiazolidin-2-yl group results in the formation of a <IMAGE> group, which may be protonated under the reaction conditions, followed by cleavage of said <IMAGE> which cleavage is anchimerically assisted or accelerated by said <IMAGE> to provide after protonation, an <IMAGE> group in a dye chromophore. In a preferred embodiment the precursor is a substantially colorless compound.
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