Patent ID: 7871599

Claim:
A method of treating hair comprising the steps of (a) applying to the hair a leave on hair treatment composition comprising: i) an alpha-hydroxyl acid component that is citric acid, tartaric acid, their salts or mixtures thereof; and ii) a xanthine component comprising a substituted xanthine of the formula: wherein R 1 and R 2 are independently selected from H or substituted or unsubstituted C 1 to C 5 alkyl, and R 3 is substituted or unsubstituted C 1 to C 5 alkyl, and wherein the total amount of alpha-hydroxy acid component i) and xanthine component ii) present in the leave on hair treatment composition is from 2 to 5 wt. % and wherein the ratio of i) to ii) is from 1:3 to 3:1 and iii) from 0.001 to 10% by weight of a styling polymer, wherein the leave on hair treatment composition is applied to increase the high humidity style retention of the hair, and (b) styling the hair on which the leave-on hair treatment composition has been applied.