| 摘要 |
PURPOSE: To provide attractive education and amusement inclusive of a hue by providing a color forming region changed from a colorless state to a colored state by applying a color forming aid. CONSTITUTION: Printed matter 1 printed by using an ink containing a color former changed from a colorless state to a colored state by a color forming aid 5 and the color forming aid 5 are provided. The color former is an electron donating color forming compd. selected from 2-(4-dodecyloxy-3-methoxystyryl) quinoline, 3-cyclohexylamino-6-chlorrofluorane, 3-diethylaminobenzo [a ]fluorane, 3-(4-dimethylamino-2-ethoxyphenyl)-3-(1-ethyl-2-methylindol-3-yl)--4-a zaphthallde, 3,3-bis [4-diethylamaino-2-ethoxylphenyl ]-4-azaphthalide and 3- cyclohexylmethylamino-6-methyl-7- -anilinofluorane. The color forming aid is an electron acceptive coupling compd. selected from zinc salicylate an bisphenol A. |
