Bleach regenerator composition and its use to process reversal c

Details Bleach regenerator composition and its use to process reversal c Bleach regenerator composition and its use to process reversal c

1996-08-08

1997-07-29

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Bleaching

430379, 430398, G03C 744

Patent

active

056520875

ABSTRACT:
A ferric-EDTA bleach regenerator composition can be mixed with bleach overflow to provide a bleach replenisher for reversal color silver halide photographic processes. The bleach regenerator composition has a critically controlled pH between about 6.0 and about 6.5, and comprises a total bromide ion concentration of at least about 210 g/l, and ferric ion in an amount of at least about 50 g/l. At least 50% of the bleach overflow and the bleach regenerator composition are mixed in at least a 1:1 volume ratio. After pH adjustment to from about 5.4 to about 5.6, the pH adjusted replenisher is supplied to the bleach tank for use in the process.

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