What is the naturally occurring substance found in red wine that can give it a sometimes bitter, dry, or astringent feel?

Tannins are a naturally occurring substance usually found in red wine, though in some whites too, that can give the wine a bitter, dry, or astringent taste. Tannins come from the skin, seeds, and stems of the grape, and are transferred to the wine through extended contact of the juice with the skins.

Asked by Jason Forbes · Last updated 5 years ago · 7.1K views · SOURCE