| 摘要 |
A directly imageable planographic printing plate that is high in image productivity and easy to check comprises at least a substrate, a thermo-sensitive layer and a ink-repelling layer in this order, wherein the thermo-sensitive layer in the printing area contains a dye that has an absorption maximum in the range of 400 nm to 700 nm, and the difference between the reflected absorption of the non-printing area and the reflected absorption of the printing area, observed at the absorption maximum wavelength of the dye, is not less than 0.3 and not more than 2.0. Such a plate can be produced from a precursor by applying to it a laser beam, removing the ink-repelling layer from the laser irradiated portion and dyeing, with a dyeing solution, a printing area which is free from the ink repelling layer. |
