| 摘要 |
PROBLEM TO BE SOLVED: To provide a water base ink which has high discharge stability and storage stability and, simultaneously, can obtain prints having very superior water resistance, and an inkjet recording apparatus and an inkjet recording system using the same. SOLUTION: The water base ink being a dye mixture ink comprises at least two kinds (D1 and D2) of dyes and meets the relationship among the color change ratio ΔEmix of the resistance to deterioration by water of the dye mixture ink, measured by the water resistance test, the color change ratio ΔED1 of the resistance to deterioration by water of an ink containing only dye D1 as the dye, and the color change ratio ΔED2 of the resistance to deterioration by water of an ink containing only dye D2 as the dye to be represented by the formulae: ΔEmix/ΔED1<1 and ΔEmix/ΔED2<0.8 and, simultaneously, the relationship between the contents CD1 and CD2 (wt.%) of dyes D1 and D2 in the dye mixture ink to be represented by the formula: 1.0<=CD1/CD2<=5.0. |
