To provide an original printing plate for a lithographic printing plate with good image forming properties such as fine line reproducibility and plate wear even when a protective layer coating liquid dissolving a part of components of an image recording layer is applied on the image recording layer.
In the original printing plate for the lithographic printing plate having the image recording layer and a protective layer in this order on a substrate, the original printing plate for the lithographic printing plate is characterized in that the protective layer is formed by using a coating liquid with a thixotropic index of larger than 2.0 expressed by a specified formula, and the image recording layer is dissolved at least 5 mass% to the solvent of the coating liquid.
OSHIMA ATSUSHI
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu
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