Patent ID: 7655220

Claim:
A method of straightening hair comprising: i) applying a hair straightening composition to hair converting disulfide bonds to lanthionine bonds; ii) rinsing said hair straightening composition with water; and iii) shampooing said hair, and wherein said hair straightening composition comprises components (A) and (B): (A) a diamide compound represented by the following formula (1): wherein, R 1 represents a linear or branched C 1-12 hydrocarbon group which may be substituted by a hydroxy and/or alkoxy group, R 2 represents a linear or branched divalent C 1-5 hydrocarbon group, and R 3 represents a linear or branched divalent C 1-22 hydrocarbon group, and (B) an alkali agent, and wherein said composition has a pH of from 12 to 14 when diluted to 10 times with water.