Method of manufacturing a support for a lithographic printing plate

A method of manufacturing a lithographic printing plate support

• wherein an aluminum plate is subjected at least to, in order, a mechanical graining treatment in which the aluminum plate is grained to a mean surface roughness Ra of 0.25 to 0.42 μm using a brush and a slurry containing an abrasive, an electrochemical graining treatment in which the aluminum plate is grained using an alternating current in an aqueous solution containing nitric acid and aluminum ions, and an alkali etching treatment in which the aluminum plate is etched in an aqueous alkali solution, thereby obtaining the lithographic printing plate support having a mean surface roughness Ra after the alkali etching treatment of 0.43 to 0.60 μm, and
• wherein the aqueous solution has a ratio R of an aluminum ion concentration A to a nitric acid concentration N of at least 0.6, the alternating current has a ratio r of an amount of electricity QR when the aluminum plate acts as a cathode to an amount of electricity QF when the aluminum plate acts as an anode which satisfies a relationship 0.8≦r≦1.0.