Compsn. for permanent waving of hair based on keratin-redn. contains, in the ready-for-use formulation, 3-25 wt.% 2,3-dimercapto-succinic acid (I) and/or its salts as the keratin-reducing agent. (I) are pref. the NH4 or monoethanolamine salts. The compsn. has pH 6-9. The compsn. opt. contains additional keratin-reducing agents other than (I), e.g. thioglycolic acid, thiolactic acid, 3-mercaptopropionic acid, cysteine (or derivs.) or cysteamine (or derivs.). The hair is washed before and/or after waving with the compsn., then oxidatively treated, washed with water, opt. shampooed and set and then dried. The compsn. is applied to the hair for 5-30 min., partic. using 60-120 g of formulation.
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