FIELD: chemistry.
SUBSTANCE: invention relates to cosmetology, specifically to a water-based hair straightening composition, having pH between 12 and 14, containing i) a hydroxide ion generator selected from a group comprising lithium hydroxide, potassium hydroxide, guanidine hydroxide and sodium hydroxide; and ii) 0.5-20 wt % urea, where the weight ratio of urea to the hydroxide ion generator is between 12:1 and 3:1. The invention also relates to a method for lanthionisation of keratin fibre.
EFFECT: invention reduces hair damage caused by hydroxide-based straightening compositions.
5 cl, 5 ex, 4 tbl
