Dry heat-activated bleaching of silver images

Details Dry heat-activated bleaching of silver images Dry heat-activated bleaching of silver images

1978-02-17

1979-09-18

Kelley, Mary F.

Gas separation: apparatus

Electric field separation apparatus

With means for vapor or liquid contact

96 73, 961141, 96 50R, 96 66T, G03C 700, G03C 176, G03C 102

Patent

active

041681703

ABSTRACT:
A dry, activator sheet for a dry, thermal silver dye-bleach process, in the absence of a silver dye-bleach catalyst, comprises a support having thereon a nonvolatile, diffusible acid and a non-hydrolyzable polymeric vehicle having an effective pH up to 4.0 and a melting point lower than 200.degree. C. The activator sheet is useful to bleach a silver image containing a bleachable dye.

REFERENCES:
patent: 2624725 (1953-01-01), Bjorksten et al.
patent: 3347675 (1967-10-01), Henn et al.
patent: 3414411 (1968-12-01), Michel et al.
patent: 3493372 (1970-02-01), Gompf et al.
patent: 3647440 (1972-03-01), Rasch
patent: 3708300 (1973-01-01), Luckey
patent: 3826653 (1974-07-01), Jacobs
patent: 3874895 (1975-04-01), Hayashi et al.
patent: 3904418 (1975-09-01), Mowrey et al.
patent: 3930859 (1976-01-01), Corrigan

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