| 摘要 |
<p>PURPOSE:To obtain the titled composition having color changing properties, capable of coloring and decoloring printed matters when necessary, containing a pH indicator. CONSTITUTION:Preferably an aqueous ink composition is blended with a pH indicator [e.g. quinoline blue, ethyl-bis(2,4-dinitrophenyl) acetate, o- Cresolphthalein, phenolphthalein, thymolphthalein or nitramine] to give the aimed composition.</p> |
