Abstract: A process for permanently deforming keratin fibers is provided wherein the fiber is treated with 1) a keratin-reducing substance, 2) a physiologically compatible salt of an organic or inorganic acid anion and a divalent cation or Al.sup.3+, and 3) a compound selected from the group consisting of Vitamin C, Vitamin B.sub.5, derivatives thereof and mixtures thereof. The salt 2) and compound 3) can be applied in the form of a wave lotion or an intermediate treatment formulation. Also provided are wave lotions and hair treatment formulations comprising the salt 2) and the compound 3).

Abstract: Hair-cosmetic compositions for improving the structure, resilience and strength of hair comprising a content of onic acids derived from aldohexoses or disaccharides containing a free aldehyde function and/or their .gamma.- or .delta.-lactones and a method of improving the structure and strength of hair, particularly hair which has been adversely affected by cosmetic treatments such as dyeing, bleaching, permanent waving, etc.