Method of bleaching metallic silver

Details Method of bleaching metallic silver Method of bleaching metallic silver

1974-06-24

1976-05-04

Kelley, Mary F.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96 60BF, 96 61R, 75118P, G03C 532, G03C 538, C22B 1100

Patent

active

039544737

ABSTRACT:
This invention relates to a method of bleaching metallic silver by treating a preformed deposit of metallic silver with a silver complexing agent that forms a silver complex having a log stability constant of .beta..sub.3 .gtoreq. 10.sup.18 in the presence of an electron acceptor. In a preferred embodiment, the silver complexing agent is an organic tertiary phosphine and the electron acceptor is an n or .pi. type charge receptor having an electron affinity between 1 and 2 electron volts.

REFERENCES:
patent: 3019108 (1962-01-01), Dershowitz
patent: 3578449 (1971-05-01), Bloom
patent: 3582340 (1971-06-01), Kuwabara et al.
patent: 3594169 (1971-07-01), Bloom et al.
patent: 3640713 (1972-02-01), Buckler et al.

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