Patent ID: 6843839

Claim:
An ink comprising: a first coloring material represented by the following general formula 1; a second coloring material represented by the following general formula 2; and an aqueous medium, wherein R 1 represents a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted aryl group, R 2 and R 4 represent, independently, a hydrogen atom, or a substituted or unsubstituted alkyl group, R 3 represents a substituent selected from the group consisting of a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, and a halogen atom, X 1 represents a carboxyl group or a salt thereof, or a sulfonic acid group or a salt thereof, and n represents 1 or 2; wherein Ar 1 represents a substituted or unsubstituted phenyl group, or a substituted or unsubstituted naphthyl group, Ar 2 represents an acetyl group, a benzoyl group, a 1,3,5-triazinyl group, a SO 2 —C 6 H 5 group, or a SO 2 —C 6 H 4 —CH 3 group, M represents a counter ion to a sulfonic acid group that is selected from the group consisting of a hydrogen atom, an alkali metal, an ammonium, and an organic ammonium.