| 摘要 |
In one embodiment, the present invention is concerned with novel xanthene compounds of the formula <IMAGE> A(-) wherein each R1 the same or different is hydrogen or alkyl, each R2 the same or different is alkyl or phenyl, R3 is phenyl or alkyl, Y is an electron-withdrawing group and A is an anion. In another embodiment, the present invention is concerned with photographic products and processes employing these xanthene compounds.
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