A kit for colouring hair, comprising:ii) a first aqueous composition, comprising 0.01 to 10wt% of the total first composition of a polyphenol having a pH at 20 °C from 5.5 to 9.0 andii) a second aqueous composition comprising 0.01 to 10 wt% of the total second composition of iron, where the iron is present as the Fe(II) complex and/or Fe(III) complex and the pH at 20 °C of the composition is from 5.5 to 8.0.