| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a planographic ink printing method by which the color reproduction region of RGB, especially B (blue violet), having been expressed by six or seven color printing methods using conventional yellow, red, indigo and black process four colors and further orange, green, violet and the like can be reproduced by the overprinting of red and indigo. <P>SOLUTION: This planographic printing ink composition having good violet color reproductivity, comprising overprinting red and indigo inks, is characterized in that the coloring component of the red ink is a metal chelate compound of a rhodamine-based dye, and the coloring component of the indigo ink is a phthalocyanine-based compound. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
