Patent ID: 7618484

Claim:
An ink jet ink comprising at least two coloring materials of a first coloring material and a second coloring material, wherein the first coloring material is (a) a compound represented by the following general formula (I): wherein R independently represents a hydrogen atom, an alkyl group, a hydroxyalkyl group, a cyclohexyl group, a monoalkylaminoalkyl group, or a dialkylaminoalkyl group; M independently represents a hydrogen atom, an alkali metal, ammonium, or organic ammonium; and X represents a linking groups; and/or (b) a compound represented by the following general formula (II): wherein R 1 represents an hydrogen atom or an alkyl group; m represents an integer of 1 to 3; and M independently represents a hydrogen atom, an alkali metal, ammonium or organic ammonium, and wherein the second coloring material is a compound represented by the following general formula (III): wherein R 2 , R 3 , R 4 , and R 5 , each independently represent an alkyl group; and M independently represents a hydrogen atom, an alkali metal, ammonium, or organic ammonium, and wherein the mass ratio of the content (% by mass) of the first coloring material to the content (% by mass) of the second coloring material is from 2.5 or more to 10.0 or less.