| 摘要 |
<p>The present invention provides a CTP positive lithographic printing original plate which has satisfactory image contrast even after baking. Disclosed is a positive lithographic printing original plate, including a substrate, and an image forming layer containing a water-insoluble and alkali-soluble resin and a photo-thermal conversion material, formed on the substrate, wherein the image forming layer contains an acid dye as a colorant.</p> |
