FIELD: food industry. SUBSTANCE: dried residue of Aronia melanocapra recens is affected by grinding and then is treated with acetic aldehyde comprising 0.5-10 mass parts of concentrated orthophosphoric acid. Then separation of reaction medium, filtering, drying and extracting are carried out. Dye are extracted with heated ethyl alcohol being acidified with butyric acid. Then organic layer is separated of raw materials. EFFECT: improved efficiency of the method. 1 tbl
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