An object of the present invention is to provide a color developing composition which develops colors in a high density and does not significantly discolor when aged, a lithographic printing plate precursor which has excellent plate-inspecting properties by means of color development and is capable of maintaining strong color development even when aged after color development, a plate making method for a lithographic printing plate in which the lithographic printing plate precursor is used, and a new compound that can be preferably used as a color developer.
The color developing composition of the present invention includes a compound represented by Formula 1. The compound in the present invention is represented by Formula 1. In Formula 1, R1 represents a group in which an R1-O bond is cleaved by heat or exposure to infrared rays.
本发明的目的是提供一种显色密度高且老化后不会明显褪色的显色组合物、一种通过显色具有优异的验版性能且即使显色后老化也能保持较强显色性能的平版印刷版前体、一种使用该平版印刷版前体的平版印刷版制版方法以及一种可优选用作
显色剂的新型化合物。
本发明的显色组合物包括一种由式 1 表示的化合物。本发明中的化合物由式 1 表示。在式 1 中,R1 代表一个基团,在该基团中,R1-O 键通过加热或红外线照射而裂解。