ArticlePerfecting Pyment, Vinifera Vines, and Over-YeastingWritten by Alison Crowe. . . you could also buy some powdered grape tannin, use oak chips, or even use a cup of strong black tea to add some tannin backbone to the wine if it’d be tough for you to obtain grape skins.Already a member? Log InYou'll Also Like Article MEMBERS ONLY “Fruit Floaties”, Sweetening Wine, Free SO2 levels Because sulfur dioxide is so easily-oxidizable, hydrogen peroxide naturally ‘finds’ the easily-oxidized SO2 and the two hopefully cancel each other out. Article MEMBERS ONLY Brett in the Winery, Hangover Myths, and Grapes In Albuquerque Brettanomyces is often an ambient microbe in the air we breathe, but that’s no reason to go inviting concentrated and healthy stocks of it into your cellar.