Patent ID: 6174643
Filing Date: 2001-01-16
Classification: G03F

Abstract:
In a process for developing a lithographic printing material having physical development nuclei between an anodized aluminum support and a silver halide emulsion layer containing 95 mole % or more of silver chloride based on the total amount of the silver halide after imagewise exposure,when development of the lithographic printing material is carried out by using a developing solution having a pH of 13.0 at a development temperature of 25.degree. C. and a development time of 40 seconds, a decreased amount of aluminum oxide in the aluminum support is 0.8 g or more per 1 m.sup.2 of the support,the improvement wherein the process for developing a lithographic printing plate comprises subjecting to development so as to control the decreased amount of said aluminum oxide being 0.6 g or less per 1 m.sup.2 by combining the development conditions of the pH of the developing solution of 12.7 to 11.5, the temperature of the developing solution of 20 to 30.degree. C., and the development time of 10 to 25 seconds.