Patent ID: 7198664

Claim:
An ink jet black ink comprising a dye and a black pigment, wherein the dye is at least one kind selected from the group consisting of compounds represented by the following formula (I) or salts thereof, and compounds represented by the following formula (II) or salts thereof; wherein R 1 and R 2 each independently represent a hydrogen atom, a hydroxyl group, an amino group, a carboxyl group, a sulfonic group, an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms; and R 3 and R 4 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a hydroxyl group, an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group or with an alkoxy group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms and which may be substituted with a hydroxyl group, with an alkoxy group having 1 to 4 carbon atoms, with a sulfonic group, or with a carboxyl group, or an amino group which is substituted with an alkyl group or with an acyl group; and n represents 0 or 1; and wherein R 1 , R 2 , R 3 , and R 4 each independently represent a hydrogen atom, a hydroxyl group, an amino group, a carboxyl group, a sulfonic group, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkoxy group substituted with a hydroxyl group, an alkoxy group having 1 to 4 carbon atoms, a sulfonic group or a carboxyl group, an alkoxy group having 1 to 4 carbon atoms and which may be further substituted with a carboxyl group or with a sulfonic group, or an amino group substituted with a phenyl group, with an alkyl group, or with an acyl group; and n represents 0 or 1.