| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a water-erasable Indian ink composition for paintings and writings, easily erasable by washing when accidentally attached on clothing and capable of keeping color black after written on Japanese writing paper. <P>SOLUTION: The water-erasable Indian ink composition for paintings and writings comprises an acid dye and an aqueous medium, wherein the acid dye has two or more sulfonic groups in the structure and comprises three or more including an azo (except ones whose aromatic ring is substituted with alkyl, nitro, amino or alkoxy) or triphenylmethane-based red dye, a yellow dye and a blue dye and these are compounded at a ratio of 28-65 mass% red dye, 13-46 mass% yellow dye and 15-38 mass% blue dye. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
