A stable, aqueous hair dyeing emulsion with good Theological properties is prepared, while simultaneously substantially reducing the manufacturing time and energy consumption, comprising at least one oxidation hair dyestuff precursor, by mixing a water-in-oil emulsion, comprising 10% to 50% by weight of at least one nonionic emulsifier, 10% to 50% by weight of at least one nonionic co-emulsifier selected from the group of C10-C22-fatty alcohols, C12-C18-fatty acid mono- and dialkanolamides and/or C10-C22-fatty acid esters with polyvalent alcohols, 5% to 40% by weight of oleic acid, and up to 25%, in particular 20% by weight of water, each calculated to the total w/o-emulsion composition, with an aqueous phase comprising at least one water-soluble surfactant. Mixing is carried out under shear force at 15° to 30° C., preferably at room temperature at about 20° to 25°.