Abstract: A simplified process is presented for the preparation of stable, aqueous hair dyeing emulsions, comprising at least one oxidation hair dyestuff precursor, by first preparing a homogenous oily phase comprising at least one oil-soluble emulsifier by mixing the oil components at an increased temperature between 40° and 80° C., and subsequently mixing this oily phase with an aqueous phase, comprising at least one water-soluble emulsifier under shearing force at a temperature between 15° and 30° C. Compared to conventional processes of hot emulsification, this process substantially reduces the preparation time.

Abstract: Fluent dye preparations useful for dyeing leather or wool containa) at least 15% of the weight of the dye preparation of one or more polyazo dyes in salt form which have one or more hydroxysulfonyl and/or carboxyl groups and may be present in the form of a 1:1 or 1:2 metal complex,b) from 2 to 15% of the weight of the dye preparation of a surfactant, andc) water.