| abstract |
An ink suitable for use in ink jet printing comprising a solution of a colorant in an aqueous medium, the colorant comprising at least 80% by weight of a water-soluble black dye of Formula (1> <IMAGE> wherein W is COOH X is H, COOH, SO<3>H, halo, hydroxy, nitro, cyano, C1-6-alkyl, C1-6-alkoxy, or C1-6-acylamino; Y is H, COOH or SO<3>H; Z is H, COOH or SO<3>H; and R is H or C1-4-alkyl; provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO3H groups and up to 20% of one or both of two other water-soluble dyes, one of which is a defined yellow dye and the other is a defined cyan dye. |