Dye image reversal processes and image transfer film units

Details Dye image reversal processes and image transfer film units Dye image reversal processes and image transfer film units

1979-11-01

1981-03-24

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Transfer procedure between image and image layer, image...

Diffusion transfer process, element, or identified image...

430218, 430236, 430239, 430242, 430375, 430379, 430380, 430390, 430502, 430505, 430506, 430509, G03C 140, G03C 700, G03C 554, G03C 176

Patent

active

042581176

ABSTRACT:
A method is disclosed of photographically processing a negative-working imagewise exposed silver halide photographic element to produce a reversal dye image comprising (a) developing the imagewise exposed silver halide with an electron transfer agent to produce oxidized electron transfer agent which reacts with a competing oxidizable substance and (b) developing silver halide remaining with the electron transfer agent in the presence of a dye image providing compound capable, after the competing oxidizable substance has been depleted, of reacting with the oxidized electron transfer agent to produce a reversal dye image. Image transfer film units are disclosed useful in the practice of this method. Such film units include those containing in addition to the competing oxidizable substance and initially immobile dye image providing compound a layer containing additional silver halide and a scavenger separating the additional silver halide from the immobile dye image providing compound.

REFERENCES:
patent: 3243294 (1966-03-01), Barr
patent: 3619156 (1971-11-01), Arai et al.
patent: 3647452 (1972-03-01), Hendess et al.
patent: 3938995 (1976-02-01), Gompf et al.
patent: 3998637 (1976-12-01), Faul et al.

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