cis-3,5,3',4'-tetrahydroxystilbene

Red wine is a type of wine made from dark-colored (black) grape varieties. The actual color of the wine can range from intense violet, typical of young wines, through to brick red for mature wines and brown for older red wines. The juice from most purple grapes is greenish-white, the red color coming from anthocyan pigments (also called anthocyanins) present in the skin of the grape; exceptions are the relatively uncommon teinturier varieties, which produce a red-colored juice.Much of the red-wine production process therefore involves extraction of color and flavor components from the grape skin.

White wine is a wine that is fermented without skin contact. The colour can be straw-yellow, yellow-green, or yellow-gold.It is produced by the alcoholic fermentation of the non-coloured pulp of grapes, which may have a skin of any colour.White wine is mainly from "white" grapes, which are green or yellow in colour, such as the Chardonnay, Sauvignon, and Riesling.