Photographic products employing novel nondiffusible 4-...

Details Photographic products employing novel nondiffusible 4-... Photographic products employing novel nondiffusible 4-...

G - Physics

03

C

96/139

G03C 1/40 (2006.01) G03C 8/10 (2006.01)

Patent

CA 1287766

PHOTOGRAPHIC PRODUCTS EMPLOYING NOVEL NONDIFFUSIBLE 4-ARYLAZO-1-HYDROXY-2-CARBOXY ESTER SUBSTITUTED NAPHTHOIC IMAGE DYE-PROVIDING COMPOUNDS Abstract of the Disclosure Photographic elements and assemblages are described which employ nondiffusible 4-arylazo-1- hydroxy-2-carboxy ester substituted naphthoic image dye-providing compounds capable of releasing diffusible dye moieties which undergo substantial hue shifts at low, or acidic, pH values but which provide desired hues at neutral or basic pH values used for viewing or processing.

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