FIELD: chemistry.
SUBSTANCE: colouring composition having a blue colour contains one or more anthocyans; metal ions of Fe (II), tannic acid as a stabiliser, in which the molar ratio of metal ions to anthocyanins is, at least, 0.5:1, and the molar ratio of stabiliser to anthocyanin is, at least, 0.5:1. The method for preparing a colouring composition having a blue colour comprises adjusting the pH of the anthocyan solution to a value between 3.5 and 8.0 before addition of Fe (II) metal ions and tannic acid as a stabiliser. Herewith the ratio of metal ions to anthocyanins is, at least, 0.5:1, and the molar ratio of stabiliser to anthocyanin is, at least, 0.5:1. The invention relates to the composition comprising a colouring composition, in which the pH is in the range of 3.5 to 8.0 and the composition is blue or green.
EFFECT: improving the compound properties.
13 cl, 1 dwg, 16 tbl, 9 ex
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