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Oenocyanine

Blue-red dye (also known as oenin) obtained from the pressing residues of dark-skinned grapes. The substance present in the berry skins consists of anthocyanins, other phenols and pigments. It is used as a food colouring, but is prohibited within the EU as an additive to wines. In contrast, the use of so-called oenological tannins is allowed within the EU without restriction

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