FIELD: dying and finishing industry. SUBSTANCE: method involves two-staged processing of materials in dying solution in the presence of acidic agent - sulfuric acid amide initially at low temperature and further at high temperature. At second stage temperature is maintained in the range of 80-85 C. EFFECT: improved strength of dyed fibrous materials and dying quality, reduced processing temperature at second stage and reduced total process time. 1 tbl, 11 ex
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