It was found that methyl phloroglucinol exhibits surface-active properties. The MPG adsorption isotherms can be assigned to class S-2 in the Giles classification. In adsorption of MPG, a bimolecular layer is formed. A principle was formulated for selecting the conditions for dyeing with insoluble azo dyes on textile materials made from a fibre blend where the colors have high strength indexes. It was shown that MPG, not previously used as an azotol in dyeing blended fabrics (wool + Nitron) by formation of insoluble azo dyes on the fibre, and this allows expanding the color range and improving the technology for dyeing textile materials.