Photographic products employing nondiffusible 4-arylazo-1-hydroxy-2-carboxy ester substituted naphthoic image dye-providing compounds
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 desi...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | 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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