lization of the capillary-porous structure with the required level of hygienic properties. An innovative direction of effective tanning of leather is the use of tanning compositions based on montmorillonite dispersions [1]. This contributes to the complex formation of the structure of derma via formation of bonds not only between collagen and tanning compound, but also between the mineral, tanning compound and collagen. To enhance the effectiveness of the above-mentioned method of tanning, it is important to establish and identify chemical interactions both for the modified mineral, and for derma collagen after treatment with obtained tannic compositions. Accordingly, it is necessary to consider that research, aimed at the application of modified montmorillonite dis