PLATE MAKING METHOD FOR PLANOGRAPHIC PRINTING PLATE

摘要

PROBLEM TO BE SOLVED: To provide a plate making method for an aluminum planographic printing plate with which high ink receptitivity is stably obtainable and to provide a plate making method which obviates the degradation in the ink receptitivity in running processing. SOLUTION: This plate making method consists in subjecting a planographic printing plate having physical development nuclei between an aluminum base and silver halide emulsion layers to processing with at least a developer, washing liquid and finishing liquid in this order after exposure. At this time, the washing liquid contains urea or its deriv.