Method of treating photosensitive printing plate.

摘要

The present invention provides a method of treating photosensitive printing plate, which comprises subjecting a photosensitive lithographic plate to exposure, development and burning-in treatment, characterized in that an aqueous solution containing phytic acid and aminobenzenesulfonic acid is applied to the lithographic plate after the development but prior to the burning-in treatment and then the burning-in treatment is conducted in the presence of these compounds.

According to the invention, there can be prepared a lithographic plate free from background stain and having an excellent ink-receptive property in its image-forming area.