| abstract |
A composition of a water-soluble bis-azo dye of formula (1) and an oxidising agent, wherein A is optionally substituted phenyl or optionally substituted naphthyl; B is optionally substituted phenylene or optionally substituted naphthylene; R1 is H or sulpho; R2 is H, optionally substituted alkyl, optionally substituted aryl or optionally substituted acyl; R3 is H, optionally substituted aryl, optionally substituted alkyl or a group, -D-E; D is optionally substituted C¿2-6?-alkylene; and E is a group of formula (1a); R?4 & R5¿ each independently is H or optionally substituted alkyl; and R6 is H, optionally substituted alkyl, optionally substituted aryl or optionally substituted acyl. |