| 摘要 |
PURPOSE:To prevent the development of ground color from occurring due to adhesion of an organic solvent, by using a color developer capable of developing a color when being heated. CONSTITUTION:A compound which has a structure with a hydrogen atom in a phenolic OH subst. by an allyl or acyl group as a part of the molecular structure thereof and which does not has a color developing capability when being dissolved in an organic solvent such as an alcohol but has the color developing capability for a leuco dye through formation of a phenolic OH by a thermal transition reaction of the allyl or acyl group when being heated, is used as a color developer. The leuco dye, used either singly or in combination, is a leuco compound of a dye based on triphenylmethane, fluoran or the like. |
