Abstract: A compound of Formula (1) or a salt thereof: wherein: X is N or C(CN); Z is optionally substituted naphthyl; Ar is an aryl group carrying at least one substituent selected from the group consisting of an acetyl group, an acetate ester group, an amide group, a sulfonamide group, a sulfoxide group, a sulfone group, a phosphonate group, a nitrile group, an isonitrile group, a quaternary amine, a carbonyl group (other than a carboxylic acid), a polyhaloalkyl group or a halogen atom; and Ar may optionally be substituted with one or more further substituents.

Abstract: A compound of Formula (1) or a salt thereof: wherein: X is N or C(CN); Z is optionally substituted naphthyl; and Ar is an aryl group carrying at least one nitro substituent and optionally one or more further substituents.

Abstract: A compound of Formula (1) or a salt thereof: wherein: X is N or C(CN); Z is optionally substituted naphthyl; and Ar is an aryl group carrying at least one nitro substituent and optionally one or more further substituents. Also compositions, inks, printing processes, printed material and ink-jet cartridges.

Abstract: A compound of Formula (1) or a salt thereof: wherein: X is N or C(CN); Z is optionally substituted naphthyl; Ar is an aryl group carrying at least one substituent selected from the group consisting of an acetyl group, an acetate ester group, an amide group, a sulfonamide group, a sulfoxide group, a sulfone group, a phosphonate group, a nitrile group, an isonitrile group, a quaternary amine, a carbonyl group (other than a carboxylic acid), a polyhaloalkyl group or a halogen atom; and Ar may optionally be substituted with one or more further substituents. Also compositions, inks, printing processes, printed material and ink-jet cartridges.

Abstract: A compound of Formula (1) or a salt thereof: A-N?N-D-N?N—B—N?N-A/??Formula (1) wherein A is an optionally substituted aryl, heteroaryl, non-aromatic heterocyclic or alkenyl group; D is an optionally substituted, optionally metallized 1,8-dihydroxynaphthalene group; B is an optionally substituted organic linking group; and A/ is an optionally substituted pyrazolyl group which does not have an aromatic group as a substituent directly attached to either of the nitrogen atoms of the pyrazolyl ring. Also provided are compositions, inks, ink sets, substrates and cartridges all containing the compound or salt and printing processes using the compound or salt. The compounds and salts are especially useful for ink-jet printing.

Abstract: A compound of Formula (1) or a salt thereof: A-N?N-D-N?N—B—N?N-A???Formula (1) wherein A is an optionally substituted aryl, heteroaryl, non-aromatic heterocyclic or alkenyl group; D is an optionally substituted, optionally metallised 1,8-dihydroxynaphthalene group; B is an optionally substituted organic linking group; and A? is an optionally substituted pyrazolyl group which does not have an aromatic group as a substituent directly attached to either of the nitrogen atoms of the pyrazolyl ring. Also provided are compositions, inks, ink sets, substrates and cartridges all containing the compound or salt and printing processes using the compound or salt. The compounds and salts are especially useful for ink-jet printing.

Abstract: A process for printing an image on a substrate including applying thereto a composition comprising a liquid medium and a tris-azo compound of Formula (1) or salt thereof: wherein: A is an optionally substituted alkenyl, homocyclic or heterocyclic group; L1 and L2 are each independently optionally substituted aryl or heteroaryl; and m and n are each independently 0 or 1 such that m+n is 1 or 2; wherein: (i) the compound of Formula (1) is optionally in the form of a metal chelate; and (ii) at least one of L1 and L2 carries at least one substituent selected from sulpho, carboxy, C1-4-alkoxy and C1-4-alkoxy-OH. Also claimed are compositions and compounds comprising Formula (1).

Abstract: Inks comprising a liquid medium and a tris-azo compound of Formula (1) or salt thereof: wherein the liquid medium comprises water and an organic solvent.