Patent ID: 7947815

Claim:
An azo dye represented by the following formula (IA): wherein, in formula (IA), R 1A , R 2A , R 3A , and R 4A each independently represent a hydrogen atom, an aliphatic group, an aryl group, a halogen atom, an acyl group, a cyano group, an acylamino group, an aliphatic oxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an aliphatic sulfonyl group, an arylsulfonyl group, a sulfamoyl group, an aliphatic oxycarbonylamino group, an aryloxycarbonylamino group, a sulfo group, a carboxyl group, a carbamoylamino group, a sulfamoylamino group, or an aliphatic- or aromatic-sulfonylamino group, wherein R 1A and R 2A and/or R 3A and R 4A may be combined with each other to form a five- or six-membered aromatic ring or non-aromatic ring; X A represents a carbon atom or a nitrogen atom, wherein n A is 0 when X A is a nitrogen atom and n A is 1 when X A is a carbon atom.