Compositions

A water soluble compound of Formula (1) or a salt thereof: wherein: Y is an electron withdrawing group; Y 1 is H, alkyl or aryl, OR or NR 2 in which each R independently is H, optionally substituted alkyl or optionally substituted aryl; or Y and Y 1 together form a 5- or 6- membered ring; X 1 is a group or atom with co-ordinates with M; M is hexa co-ordinate metal; G is a group of Formula (2), (3) or (4); and L 1 , L 2 and L 3 , each independently represent ligands required to complete hexa-coordinate geometry around metal M; wherein: S is a water solubilizing group; Ar is a benzene or naphthalene group in which X is located ortho to the azo group; X is a group or atom which co-ordinates with M; Z provides atoms or groups which complete an optionally substituted 5- or 6-membered aromatic heterocyclic ring; Ring A is an optionally substituted aromatic ring; Ring B is an optionally substituted 5- or 6-membered aromatic heterocyclic ring; n is 0, 1, 2 or 3; and the * signify the points of attachment of the groups of Formulae (2), (3) and (4) to the N and M atoms in the compound of Formula (1). The compounds are used in compositions for ink jet printing.