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| natural tannin (any of various water-soluble polyphenols found in plant tissues that bind proteins and promote the tanning of leather; also called tannic acid [C76H52O46]) | |||
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| natural tannin (any of various water-soluble polyphenols found in plant tissues that bind proteins and promote the tanning of leather; also called tannic acid [C76H52O46]) | |||