A mixture of compounds of Formula (1) and salts thereof: wherein: M is 2H, Si, a metal, an oxymetal group, a hydroxymetal group or a halometal group; Pc represents a phthalocyanine nucleus of formula; R1 is H or optionally substituted C1-4alkyl; R2 is optionally substituted alkyl; R3 is H or optionally substituted C1-4alkyl; R4 is optionally substituted heterocycyl; L is a direct covalent bond or a divalent linking group; w, x, y and z are each independently greater than zero. Also compositions and inks, printing processes, printed material and ink-jet printer cartridges.