FIELD: wood-working industry. SUBSTANCE: method involves stripping bark from wood; grinding bark and preparing tanning agent. Bark is ground to powder state of bark cells. Tanning agent is prepared from powdered bark with the usage of dyes. Cellular tissues are removed from powdered tanning agent and dye. Impact grinding in ball mill is provided by internal breakage of cells and facilitated by outer squeezing. Tanning agent is prepared from mentioned dry components. Cellular tissues are removed from powdered tanning agent and dye by hydraulic fractioning or by mechanical dissipation method. Raw material subjected to grinding process has natural moisture content. Wet raw material is subjected to freezing. EFFECT: increased efficiency, simplified method and improved quality of tanning agent. 10 cl
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