FIELD: histochemistry. SUBSTANCE: one should carry out interaction of basic fuchsin for fuchsin sulfurous acid with paraldehyde and hydrochloric acid in aqueous medium at additional introduction of copper sulfate at its weight ratio with basic fuchsin for fuchsin sulfurous acid being 1.0 : 0.3 - 1.0 : 0.4, correspondingly, followed by isolation of residue and its drying. The innovation enables to increase output of target product and improve its dying properties. EFFECT: higher efficiency. 2 ex
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