Photographic film units containing colorless para-nitrobenzylide

Details Photographic film units containing colorless para-nitrobenzylide Photographic film units containing colorless para-nitrobenzylide

1976-07-16

1978-03-28

Klein, David

Gas separation: apparatus

Magnetic separating means

And electric field separation apparatus

96 29D, 96 73, 96 77, 96 84R, 428411, 428412, 428423, 428480, 428500, 428508, 428515, G03C 700, G03C 140, G03C 184, G03C 554

Patent

active

040812758

ABSTRACT:
A photographic film unit comprises a support having coated thereon at least one photosensitive silver halide emulsion, said layer having associated therewith a dye image-providing material, a dye image-receiving layer, means for discharging an alkaline processing composition within the film unit and at least one layer containing at least one para-nitrobenzylidene dye-forming compound. Some of the para-nitrobenzylidene dye-forming compounds are a dark color at moderately and highly alkaline conditions and are colorless at neutral or only slightly alkaline conditions such as at ambient conditions.

REFERENCES:
patent: 3647437 (1972-03-01), Land
patent: 3984248 (1976-10-01), Sturmer
Koenigs et al., Berichte, vol. 58, 1925 pp. 933-940.

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