Patent ID: 6033463
Filing Date: 2000-03-07
Classification: C09D

Abstract:
A multicolor ink set comprising:a black ink comprising at least a water-insoluble coloring material in which a carboxylic acid structure or a carboxylic salt structure is exposed to the surface, water, and a water-soluble organic solvent, and the black ink has a surface tension at 20.degree. C. from 30 to 60 mN/m; anda color ink comprising at least one water-soluble coloring material selected from the group consisting of cyan, magenta and yellow, water, and a water-soluble organic solvent, and the color ink has a surface tension at 20.degree. C. from 20 to 50 mN/m and lower than the surface tension of said black ink, and 50% by weight or more of said at least one water-soluble coloring material has a solubility in water at 20.degree. C. of 10% by weight or less.