A color-forming composition contains (A) a radical generator, (B) a compound represented by the following formula (1) and (C) a binder polymer:
wherein, in the formula (1), R
1
represents a group which reacts with a radical generated from the radical generator (A) to be released and forms a dye after the release, and T represents a nitrogen-containing hetero ring.
一种色彩形成组合物包含(A)自由基发生剂,(B)由以下式子(1)表示的化合物和(C)粘合剂聚合物:其中,在式子(1)中,R1代表与自由基发生剂(A)反应并在释放后形成
染料的基团,T代表含氮的杂环。