| 摘要 |
PROBLEM TO BE SOLVED: To obtain a color image in which a character image is clear, and no turbidity is in both a half tone image and a line drawing by containing at least a carbon black pigment, a basic surfactant and a water soluble organic solvent and being acidic. SOLUTION: As a colorant for color ink other than black ink, basic ink etc., with the use of water soluble dye such as an acid dye and a direct dye or an organic pigment, etc., are named. In black pigment ink, an acid black pigment is dispersed using a surfactant. Ink with another hue is prepared by dispersing a pigment of the hue using an anionic polymer dispersant having a carboxyl group or a sulfone group as a water soluble group. In this way, when black pigment ink and color ink are brought into contact, mutual diffusion can be controlled. |
