Human hair is dyed by aq. compositions contg. (a) 0.5-40% of colourant appropriate for dyeing keratinic materials, (b) 0.5-40% of coacervation agent, and (c) 0.2-5% of a swelling or thickening agent. (a) is pref. an acid, dispersion, reactive or metal complex colourant. (b) is pref. reaction product of higher fatty acid with lower hydroxyalkylamines, or condensation products of ethylene oxide or alkylphenol, (c) is e.g. methyl cellulose, agitates or montmorillonite-type compsn. 1-5% of an electrolyte, pref. chloride or sulphate of alkali or alkaline earth metals, and 0.j to 2.5% of a weak acid are opt. also added.
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