Patent ID: 8257913

Claim:
A processing solution for development of a lithographic printing plate precursor comprising an aqueous solution having pH of from 2 to 10 and comprising an amphoteric surfactant and an anionic surfactant selected from an anionic surfactant having an aliphatic chain and a total number of carbon atoms included in the aliphatic chain of 6 or more and an anionic surfactant having an aromatic ring and a total number of carbon atoms of 12 or more, wherein the content of the anionic surfactant is from 0.1 to 3.3% by weight of the aqueous solution, and the amphoteric surfactant is a betaine amphoteric surfactant represented by formula <2>: wherein R18, R19 and R20 each represents a hydrogen atom or an alkyl group, provided that all of R18, R19 and R20 are not hydrogen atoms at the same time.