| 摘要 |
PROBLEM TO BE SOLVED: To enable attainment of an excellent image which has water resistance in relation to ordinary paper and also a high print quality and which causes no bleeding and the like, by using ink of a specific structure wherein an anionic substance is contained. SOLUTION: It is preferable that black ink is a pigment or a carboxylic acid type dye. As for the carboxylic acid type dye, a dye having a dye structure expressed by a formula I, in the state of a free acid, is preferable. In the formula I, R1 , R2 and R2 ' are selected respectively from carboxyl, a sulfonic group, hydroxyl, an amino group, 1-2C alkyl and a hydrogen atom, and R3 , R4 , R5 and R6 are selected from the carboxyl, the sulfonic group and the hydrogen atom. X is made a structure of a formula II or III. In the formula II, R7 is selected from the carboxyl and the hydroxyl. In the formula III, R8 and R9 are made the carboxyl, the sulfonic group or the like. |
