Patent ID: 8003590

Claim:
A solid laundry detergent composition comprising a detersive surfactant and a mixture of reactive azo dyes, wherein: the reactive dye is in the form of an alkali metal salt; upon contact with water the composition has an equilibrium pH of 10.5 or greater at a concentration of 4 g/l in de-ionized water and at a temperature of 20° C.; the solid laundry detergent composition is essentially free of anionic detersive surfactant; and the mixture of reactive azo dyes comprises: (a) from 3 wt. % to 90 wt. %, based on the total weight of the mixture, of a first reactive azo dye having the formula (II): and (b) at least 3 wt. %, based on the total weight of the mixture, of at least one second reactive azo dye selected from black or blue reactive azo dyes according to the general formula (I): where A′ and B′ are independently selected from aromatic groups substituted or unsubstituted by halogen, C 1 -C 4 alkyl groups, C 1 -C 4 alkoxyl groups, sulfonyl groups, or amino groups.