| 摘要 |
PURPOSE:To lessen error of coating by making judgement easy and besides, to achieve improvement of preservation, by a method wherein as coloring matter or coloring matter precursor that of which hue varies according to variation of pH and that which varies from colored one to colorless one according to the variation of pH are jointly used. CONSTITUTION:As coloring matter or coloring matter precursor which varies from colored one to colored one according to variation of pH there are compounds which are generally used as pH indicator such as alizarin red or the like, and those of not more than 7.0 in pKa are especially preferable. As coloring matter or coloring matter precursor which varies from colored one to colorless one, triaryl methane series compounds or the like are exemplified, and the consumption thereof is preferably 1.0-10.0mg/ml. As acidic matter, that represented by the formula is preferable. In the formula R11 and R12, which are the same one or different, are preferable and represent H0 and R3 represents H. Consumption of organic developer is preferably 1.0-100.0mg/ml. |
