Tannin is a chemical substance, otherwise known as phenolic compounds which are derived from dark grape skins, seeds and stems as well as oak barrels that gives the wine its color, flavor and structure. Wines with evident tannins will produce a dry, puckery taste sensation, and we refer to these wines as being “tannic”. Tannins are our friends, for they prevent oxidation and are in part responsible for a red wine’s aging potential.
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