Lithium and magnesium ion free color developing composition and

Details Lithium and magnesium ion free color developing composition and Lithium and magnesium ion free color developing composition and

1998-11-06

2000-03-14

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Developer

430490, G03C 7413

Patent

active

060371110

ABSTRACT:
A photographic color developing composition includes a color developing agent, an organic antioxidant and at least 0.0005 mol/l of a polyaminopolyphosphonic acid calcium ion sequestering agent that has at least four phosphonic acid (or salt) groups. In addition, the total concentration of lithium and magnesium ions is less than 0.0001 mol/l. This composition can be in working strength or concentrated form (including solids), and has improved stability and reduced precipitates, and in some cases, provides improved yellow dye density.

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