| 摘要 |
Disclosed is a processing solution used for making lithographic printing plates by silver complex diffusion transfer process which contains at least one thioether derivative represented by the following formulas (I), (II) and (III): <IMAGE> (I) wherein n1 and n2 each represents 0, 1 or 2 and R1 and R2 each represents an alkylene group of 1-5 carbon atoms, <IMAGE> (II) wherein R1 represents an alkylene group of 1-5 carbon atoms, X represents a hydrogen atom, a carboxy group, an alkoxycarbonyl group, a carbamoyl group, a hydroxy group, or -OR2 in which R2 has the same meaning as -R1-S)n CH2CH2OH above, and n represents 0, 1 or 2, <IMAGE> (III) wherein X' represents an aromatic or heterocyclic group which has a carboxy group, R1 and R2 each represents an alkylene group of 1-5 carbon atoms and n represents 0, 1, 2 or 3.
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