| 摘要 |
<p>PURPOSE:To obtain a pitch-black ink giving a black image having especially improved discoloration resistance in room by using a mixture of water-soluble dyes such as gold-containing azo dye, a water-soluble organic solvent and water as essential components. CONSTITUTION:The objective ink contains (A) a water-soluble dye containing at least (i) a dye of formula I and/or II (X1 to X7 are H. Li, Na, K or quaternary ammonium), (ii) a dye having phthalocyanine skeleton and (iii) a gold- containing azo dye having red - purple - blue color tone, (B) a water-soluble organic solvent preferably composed of glycerol and nitrogen-containing cyclic compound, etc., and (C) water.</p> |
