Patent ID: 6949135

Claim:
An ink-jet ink comprising: (a) water; (b) a water-soluble dye represented by Formula (1): wherein R represents an alkyl group, each X 1 and X 2 independently represent an alkali metal, an alkaline earth metal, an alkylamine quaternary salt, an alkanolamine quaternary salt or ammonium, (c) a water-soluble dye represented by Formula (2): wherein each X 3 and X 4 independently represent an alkali metal, an alkaline earth metal, an alkylamine quaternary salt, an alkanolamine quaternary salt or ammonium, wherein a weight ratio of the water-soluble dye represented by Formula (1) to the water-soluble dye represented by Formula (2) is from 1:4 to 4:1; and (d) a water-soluble organic solvent selected from the group consisting of: (i) a 1,2-alkanediol having 4 carbon atoms or more, (ii) an alkyl ether of diethylene glycol, an alkyl ether of triethylene glycol, an alkyl ether of tetraethylene glycol, an alkyl ether of propylene glycol, an alkyl ether of dipropylene glycol and an alkyl ether of tripropylene glycol, (iii) a divalent alcohol with a branched alkyl chain, (iv) a monovalent alcohol with 1 to 3 carbon atoms.