| 摘要 |
Disclosed is a process of preparing a printing plate comprising imagewise exposing a light sensitive printing plate material comprising a hydrophilic support and provided thereon, an image formation layer and an oxygen shielding layer in that order, and developing the exposed material with an aqueous solution having a pH of from 3 to 9, wherein the image formation layer contains a photopolymerization initiator (A), a water-soluble polymeric binder (B), a polymerizable ethylenically unsaturated compound (C) and a sensitizing dye (D) represented by formula (1) or (2), and the aqueous solution contains at least one selected from compound A, compound A', compound B, compound B' and a compound represented by formula (3),
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