PLATE MAKING METHOD FOR PHOTOSENSITIVE PLANOGRAPHIC PRINTING PLATE AND WASHING LIQUID FOR PROCESSING PHOTOSENSITIVE PLANOGRAPHIC PRINTING PLATE

摘要

PROBLEM TO BE SOLVED: To provide a washing liquid for processing a photosensitive planographic printing plate used for removing a protective layer and stably usable over a prolonged period of time even when recycled and to provide a processing method using the washing liquid. SOLUTION: A photosensitive planographic printing plate having a protective layer based on a water-soluble vinyl polymer is developed after removing the protective layer using the above washing liquid for processing a photosensitive planographic printing plate containing at least one monoalcohol compound or monoketone compound.