Patent ID: 7404851

Claim:
An ink composition which comprises: a compound represented by formula (1); and a plurality of water-soluble organic solvents, wherein the water-soluble organic solvents contains at least a water-soluble organic solvent having a thioether or sulfoxide moiety in an amount of 10 mass % to 80 mass %: in formula (1), R 1 represents hydrogen atom, alkyl group, cycloalkyl group, aralkyl group, aryl group, heterocyclic group or acyl group, wherein each substituent group may be further substituted; R 2 represents hydrogen atom, halogen atom or cyano group; R 3 represents hydrogen atom, alkyl group, cycloalkyl group, aralkyl group, alkenyl group, aryl group, heterocyclic group, carboxyl group or sulfo group, wherein each substituent group may be further substituted; R 4 , R 5 , R 6 and R 7 each independently represents hydrogen atom; alkyl group, cycloalkyl group, aralkyl group, alkenyl group, aryl group, heterocyclic group, sulfonyl group, acyl group, carboxyl group, sulfo group or carbamoyl group, wherein each substituent group may be further substituted, with the proviso that R 4 and R 5 are not hydrogen atoms at the same time, and R 6 and R 7 are not hydrogen atoms at the same time; and both of A 1 and A 2 are carbon atoms which may be substituted, or one of them is a carbon atom which may be substituted and the other is a nitrogen atom.