The invention relates to a novel method for simultaneously perming and dyeing hair. Before and/or after being mechanically deformed, the hair is treated with a keratin reduction agent, rinsed and set with an oxidation agent. An aqueous preparation containing a mercapto compound or a sulphite and at least one reactive carbonyl compound-type dye chosen from the group of aromatic, heteroaromatic or unsaturated aldehydes or ketones, the dialdehydes or diketones or their acetals, hemiaminals or imine derivatives is used for reducing keratin. The preparation preferably also contains a compound with a primary or secondary amino- or hydroxy group chosen from amino acids, peptides, aromatic amines, phenols, aminophenols or nitrogen-containing heterocycles, in order to intensify the colour.
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