
Wine vinegar is a vinegar made from wine, in which the ethanol is oxidised to acetic acid by acetic acid bacteria.
Sharply acidic and sour from its acetic acid, carried by a vinous aroma; the red form is fuller and more robust, the white milder.
Serving as a souring accent rather than a structural base, it is added in small measured amounts to supply sharp acidity, and swaps loosely for another comparable vinegar.
White wine vinegar delivers essentially the same acetic acidity and a closely related vinous aroma, though it is milder and near-colourless, losing the reddish tint and fuller aroma of the red form; any vinegar of comparable acetic strength can match the acidity.
Balsamic vinegar
Traditional balsamic vinegar is made from cooked, concentrated grape must aged in wood, giving a sweet, syrupy product, whereas wine vinegar is made from fermented finished wine and is sharp rather than sweet.
Wine vinegar takes finished wine as its raw material through a two-stage process: sugars are first fermented to ethanol, then acetic acid bacteria of the genera Acetobacter and Gluconacetobacter/Komagataeibacter oxidise that ethanol to acetic acid in the presence of oxygen. The result is an aqueous solution of dilute acetic acid, typically around 4% to 18% by volume, produced in both red and white forms according to the starting wine.