| 摘要 |
Disclosed is a planographic printing plate material comprising a hydrophilic support and provided thereon, an image formation layer whose alkali solubility is changed after near-infrared laser exposure, wherein the image formation layer contains, as a infrared absorbent, a compound having absorption maximum in the wavelength regions of from 700 to 900 nm, the compound being selected from the group consisting of compounds represented by formulae IRD1, IRD2 and IRD3,
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