FIELD: medicine, pharmaceutics.
SUBSTANCE: invention refers to pharmaceutical and consumer industry in preparing dry herbal extracts used for later colouration of textile fabrics with this extract. A method for preparing the dry herbal extract of St. John's wort involves grinding herbal raw material, extracting in water, filtering, boiling down in a rotary evaporator and drying the residual product to constant weight in a drying chamber in the certain environment.
EFFECT: method described above enables preparing the extract with dry colorant weight 25% of dry herbal raw material weight.
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