A kit for colouring hair, comprising: (i) an aqueous shampoo composition comprising a) a cleansing surfactant; b) a polymer formed from at least 20 wt% of the total weight of polymer of carboxylic acid containing monomers; c) a polyphenol; in which the weight ratio of polymer b) to polyphenol c) is from 12:1 to 1:12; and ii) a second aqueous second composition, which comprises a cationic surfactant and at least 0.01 wt% of a metal ion selected from an Fe(II), Fe(III) or mixtures thereof in the form of a salt and/or complex.
