公开(公告)号：US06423458B1

公开(公告)日：2002-07-23

申请号：US09775823

申请日：2001-02-05

Applicant: Hironori Ohnishi

Inventor： Hironori Ohnishi

IPC: G03F730

Abstract: A monitoring method of a developing solution for lithographic printing plates, which comprises, when a large number of lithographic printing plates are processed by use of an automatic developing processor, adding a tracing substance stable under alkaline conditions to light-sensitive layers of the lithographic printing plates, or one or both of the developing solution which has been provided at the beginning of development and a development replenisher, and then measuring the amount of said tracing substance in the developing solution during development, thereby judging processing ability of the developing solution.