Patent ID: 6858069

Claim:
A black aqueous ink composition containing at least a trisazo dye represented by the following formula 1: wherein A represents a hydrogen atom or a carboxyl group (—COOM); R 1 , R 2 , R 3 , and R 4 each independently represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, a hydroxyl group, a sulfamoyl group, a carbamoyl group, an acetyl group, a carboxyl group, a sulfo group, or a halogen atom; Nps is selected from the group consisting of: wherein M is selected from the group consisting of a hydrogen atom, an alkali metal, ammonium, and an organic ammonium; B is selected from the group consisting of: wherein M is selected from the group consisting of a hydrogen atom, an alkali metal, ammonium, and an organic ammonium.