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wine diamonds

Synonym for Weinstein; look there.

Term for the crystalline mixture of sparingly soluble salts of tartaric acid, mainly of potassium hydrogen tartrate (including potassium bitartrate) or, to a lesser extent, calcium tartrate obtained by combining tartaric acid with potassium or calcium forms. Prose names are wine diamonds or wine stars. Tartar is particularly common in wines from overripe or late harvested grapes, 90% of these are potassium hydrogen tartrate. It differs in the form of glass fragments of similar small crystals, rods and leaves. This can already be done in the fermentation or expansion tank (raw wine stone), especially in cold treatment. The crystal formation increases with increasing alcohol content, low temperature and rising PH value (from 3.2) too. It can also lead to color changes or calcium clouding.

Tartar crystals on cork

Tartar is sparingly soluble in water and therefore settles on tank and barrel walls, on the bottom of the bottle or on the cork. In most cases, this is done only in the bottle, which is favored in cool storage. The...

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