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Sourness

A tart taste in wines, most often associated with acids and ethyl acetate. The degree of sourness in acid is a function of the pH of the wine and its titratable acidity. In technical terms, it is the hydrogen ion (actually, the hydronium ion) that stimulates the sour taste on the taste buds. The order of decreasing sourness of the primary organic acids in wine are tartaric, malic, citric, lactic, and succinic. Wines with a pH less than 3.1 or a titratable acidity more than 0.9% will taste sour.

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