In this article, tannins are substances that, when exposed, change the physicochemical and mechanical properties of leather and turn leather into leather. Vegetable tannins are commonly called tannins. Both abroad and in our country, plant extracts are mainly used to soften thick leather on shoe soles, technical leather, belt and seam leather, high boot leather and leather.
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Homidjonov et al. (2024) studied this question.
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