Fixer compositions used in planographic printing

Details Fixer compositions used in planographic printing Fixer compositions used in planographic printing

G - Physics

03

C

96/4, 96/71

G03C 5/30 (2006.01) G03C 5/38 (2006.01) G03F 7/06 (2006.01)

Patent

CA 1043613

ABSTRACT OF THE DISCLOSURE A method for the preparation of a planographic printing plate wherein a sheet material comprising an outer hardenable hydrophilic colloid layer on whose surface is concentrated a visible silver image that has been formed thereon from silver halide complexes according to the silver complex diffusion transfer process is treated with an aqueous lithographic fixer having a pH in the range of 1.0 to 6.5 and containing (1) an iron(III) salt of a polyaminopolycarboxylic acid as oxidizing agent for the silver image, (2) a compound yielding in dissolved state iodide ions as precipitating agent for silver ions, and (3) an organic cationic compound.

228987

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