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What is tannin?

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... tannin   tannic acid, or gallotannic acid, astringent vegetable product found in a wide variety of plants. Sources include the bark of oak, hemlock, chestnut, and mangrove; the leaves of certain sumacs; and plant galls. Tannin is also present in tea, coffee, and walnuts.

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Similar questions: Which commonly consumed food items contain tannins? Which plants contain tannins? Where can tannic acid be found in nature? [ Hide these questions ]

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