Removal of tin from seasoned photographic color developers

Details Removal of tin from seasoned photographic color developers Removal of tin from seasoned photographic color developers

1995-02-21

1996-02-13

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Combined

430399, 210688, 423 89, 423 90, G03C 531

Patent

active

054910480

ABSTRACT:
A process for removing tin from seasoned photographic color developers containing tin as stannous or stannate complex ions, comprising the steps of:
(a) collecting seasoned photographic color developer containing tin;
(b) treating the collected developer with a resin having a chelating group selected from the group consisting of diphosphonic acid, amidoxime and thiol, thereby removing tin from the composition.

REFERENCES:
patent: 3253920 (1966-05-01), Rees et al.
patent: 4186007 (1980-01-01), Meckl et al.
patent: 4313808 (1982-02-01), Idemoto et al.
patent: 5281631 (1994-01-01), Horwitz et al.

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