Abstract: Azo dyes of Formula (1) have utility as dyes for ink-jet printing where Formula (1) represents: which comprises any suitable form of the compound: such as salt; stereoisomer, zwitterion, polymorph, complex, isotopic form, combinations thereof in the same species and mixtures thereof; where: p represents from 1 to 7 inclusive; the napthyl moiety may be optionally substituted; R1 comprises at least one of the following substituents, optionally substituted: H, C1-4-alkyl, NHCOC1-4 alkyl, C1-4 alkoxy, NHCOaryl, NHSO2C1-4 alkyl, NHSO2aryl, NHCONR3R4 where R3 and R4 each independently comprises H, C1-4alkyl or aryl; R2 comprises H, C1-4 alkyl or C1-4 alkoxy; L1 and L2 each independently comprises at least one of the following substituents, optionally substituted: —NH2, —NHC1-4 alkyleneOH, —SC1-4alkylene —SO3H, —NHC1-4alkyleneN(C1-4alkyl)2, —N(C1-4alkyleneOH)2, —NHC1-4alkyleneSO3H, —NHC1-4alkylene(CO2H)n where n is 1, 2 or 3, —SC1-4alkyl