Process for desilvering used bleach fix baths

Details Process for desilvering used bleach fix baths Process for desilvering used bleach fix baths

1972-04-17

1977-03-29

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

96 60BF, C25C 122

Patent

active

040147649

ABSTRACT:
Photographic bleach fix baths are desilvered by electrolysis in a cell in which the cathode and anode chambers are separated by a diaphragm, with the exclusion of air, and the bleach fix bath is removed from the cell before the potential is switched off. For increasing the current yield the bleaching agent can be reduced prior to electrolysis for example by the addition of sodium dithionite.

REFERENCES:
patent: 3271279 (1966-09-01), Poor
patent: 3634088 (1972-01-01), Cooley
patent: 3642594 (1972-02-01), Crellin

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