Abstract: An ink comprising a liquid medium and a colorant, wherein the liquid medium comprises water and a water-miscible organic solvent and the colorant is of Formula (1), wherein the colorant is dissolved in the liquid medium: Formula (1) wherein: each independently is a water-solubilising group selected from sulfo, carboxy, phosphato and poly(ethylene oxide); each Z independently is optionally substituted alkyl, optionally substituted aryl or optionally substituted aralkyl; each Q independently is a direct bond or —NR— wherein R is H, optionally substituted aryl or optionally substituted alkyl; rings A,B,C and D are each independently unsubstituted or carry a substituent selected from optionally substituted alkyl, optionally substituted aryl and optionally substituted aralkyl; each n independently is from 1 to 3; and each m independently is 0, 1 or 2; provided that when either or both of the groups represented by Q is a direct bond then at least one n has a value of at least 2.

Abstract: A process for coloration of a substrate comprising applying thereto means of an ink jet printer a composition comprising a medium and a compound of Formula (1): wherein: A is optionally substituted aryl; B is optionally substituted arylene; and R1 and R2 are each independently H or optionally substituted alkyl. Also claimed are novel compounds, compositions and ink-jet cartridges for use an ink-jet printer and substrate printed with an ink-jet printer.