Photographic reversal process prebleach concentrate

Details Photographic reversal process prebleach concentrate Photographic reversal process prebleach concentrate

1997-09-26

1998-10-27

Letscher, Geraldine

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Bleach or intensification

430449, 430455, 430462, 430463, G03C 542, G03C 544

Patent

active

058276360

ABSTRACT:
A conditioning or bleach accelerating solution is prepared by diluting a concentrate up to 25 times. The concentrate contains a formaldehyde bisulfite precursor salt at from 200 to 600 g/l, sulfite ions at 0 to 200 g/l, a bleach accelerating agent at from 1.5 to 25 g/l, and a metal ion chelating agent present at up to 60 g/l. The concentrate is free of sodium ions.

REFERENCES:
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patent: 4975356 (1990-12-01), Cullinan et al.
patent: 5037725 (1991-08-01), Cullinan et al.
patent: 5523195 (1996-06-01), Darmon et al.
patent: 5552264 (1996-09-01), Cullinan et al.
patent: 5578427 (1996-11-01), Cullinan et al.

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