The invention provides a dyeing solution for lithographic printing plates and a dyeing method for waterless lithographic printing plates that show stable plate inspection characteristics with little decrease in dye concentration and less dyeing unevenness even when used for bulk plate processing. The dyeing method for waterless lithographic printing plates is designed so that when used to dye an image area formed on a waterless lithographic printing plate with a dyeing solution containing an organic solvent, the relation of |β-α| < 5 (cal/cm3)1/2 is held wherein β is the SP value of the polymer compound included in the image area and α is the SP value of the organic solvent. The dyeing solution for lithographic printing plates contains (a) a dye, (b) a specific anionic surface active agent, and (c) an organic solvent containing at least one selected from ethers and alcohols.
本发明提供了一种用于平版印刷板的染色溶液和一种用于无
水平版印刷板的染色方法,该染色溶液和方法即使用于批量印版加工,也能显示出稳定的印版检测特性,且
染料浓度几乎不会下降,染色不均匀度也较小。无
水平版印刷版的染色方法设计成当使用含有有机溶剂的染色液对无
水平版印刷版上形成的图像区域进行染色时,|β-α| < 5 (cal/cm3)1/2 的关系被保持,其中 β 是图像区域中包含的聚合物化合物的 SP 值,α 是有机溶剂的 SP 值。用于平版印刷板的染色溶液含有 (a)
染料,(b) 特定阴离子表面活性剂,和 (c) 有机溶剂,其中至少含有一种选自醚和醇的有机溶剂。