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 onium compound.
一种制备平版印刷版的方法,其中一种含有外层可硬化亲
水胶体层的片状材料,在其表面浓缩了一种由
银卤化物复合物根据
银复合物扩散转移过程形成的可见
银影像。该片状材料经过处理,使用pH在1.0到6.5范围内的含有以下三种成分的
水性平版定影剂:1.聚
氨基聚
羧酸的
铁(III)盐作为
银影像的氧化剂,2.产生溶解态
碘化物离子的化合物作为沉淀剂,用于
银离子,3.一个有机季
铵化合物。