Tannin: nm A tannin (or tannin) is an organic substance of vegetable origin, making the skins rot-proof. Tannin of oak bark, chestnut, willow. Oak tannin or tannic acid is used in tanning. Wine tannin is present in red wine. It comes from the skin, pips and stalks of the grape cluster. It is essential in red wines where it forms the tannic component which is the only one to evolve over time. The tannin gives more or less astri...
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