Method of preparing lithographic printing plate

摘要

A method for preparing a lithographic printing plate includes: imagewise exposing a lithographic printing plate precursor including a photosensitive layer containing a sensitizing dye, a polymerization initiator, a polymerizable compound and a binder polymer and an aluminum support on which a divalent cation is adsorbed in an amount of from 0.5 to 3.0 mg/m 2 prepared by treating the aluminum support with an aqueous polyvinylphosphonic acid solution and washing the treated aluminum support with an aqueous solution containing the divalent cation; and subjecting the exposed lithographic printing plate precursor (104) to a monobath development processing with a developer (107).