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Wine contains all four basic tastes. The sweet taste is provided by the alchohol and, where present, its sugars; sour taste comes from the free organic acids; the salt taste from the salts; the bitter taste from the wine's phenolic components, generally called tannins. In tasting wine, these four tastes are not perceived at the same time, they become apparent one after the other.
EMILE PEYNAUD, Knowing and Making Wine
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