Abstract: A composition comprising a compound of Formula (1) and compound of Formula (2) or salts thereof: The compositions show good light-fastness and are particularly useful for photorealistic ink jet printing.

Abstract: Compositions comprising (a) a dye of the Formula (1) or a salt thereof; and (b) a dye of the Formula (2) or a salt thereof:  wherein R1 to R10, a and b are as defined in the description. Also claimed are liquid compositions and inks containing the dyes, an ink jet printing process using the inks, an ink jet printer cartridge containing the ink and an ink jet printer containing the cartridge.

Abstract: An ink-jet printing process comprising the steps (a) and (b) in any order or simultaneously: (a) applying by means of an ink jet printer an ink to a substrate in a localised manner to form an image on the substrate; and (b) applying to the substrate a composition comprising a binder and a polymeric biguanide which has a repeat unit of Formula (1) or a salt thereof: wherein X and Y are the same or different and represent divalent organic linking groups.

Abstract: Compounds of the Formula (1) and salts thereof: wherein B1, B2, Q, R1, R2, A, Z1 and Z2 are defined in the description. Also claimed are compositions containing two or more compounds of the Formula (1), inks containing the compounds and compositions, an ink jet printing process using the inks, a substrate printed with the inks, and an ink jet printer cartridge containing an ink containing a compound of the Formula (1).

Abstract: The use of lithium as a cation for an anionic dye to enhance the light-fastness of the dye. Also claimed are the lithium salts of certain anionic dyes as defined in the description; mixed lithium/sodium salts of an anionic dye wherein the molar ratio of lithium to sodium is from 1:4 to 99:1 and at least 20 mole % of the total counter ions in the dye are lithium cations; inks containing the dyes; a method of ink jet printing using the inks; a substrate printed with the inks; an ink jet printer cartridge containing the ink and a ink jet printer containing the ink jet printer cartridge.

Abstract: A composition comprising: (a) a water-soluble magenta dye; and (b) a dye of the Formula (1) or a salt thereof: wherein R1, R2, R3 are defined in the description.

Abstract: The use of a polybasic acid and a volatile base, or a salt formed by the said acid and base, in an aqueous ink to increase the water-fastness of a water-soluble dye contained in the ink. Also claimed are novel aqueous inks containing an organic polybasic acid and a volatile base, a method of ink jet printing using the inks, a substrate printed with the inks and an ink jet printer cartridge containing the inks.

Abstract: An ink composition comprising: (a) from 0.1 to 50 parts of a dye; (b) from 0.1 to 50 parts of a sugar; (c) from 0.1 to 50 parts of a compound selected from phosphoric acid and a carboxylic acid or a salt thereof; (d) from 0 to 10 parts of a pH buffer; and (e) from 10 to 99 parts of a liquid medium; wherein all parts are by weight and the total number of parts (a)+(b)+(c)+(d)+(e)=100. Also claimed is a recording sheet comprising a substrate coated or impregnated with a sugar, a compound selected from phosphoric acid and a carboxylic acid or a salt thereof and optionally a binder; a coating composition; a method of ink jet printing; a substrate printed according to the method; and an ink jet printer cartridge which contains the ink and/or the coating composition.