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 Evaporation Clarification, “Big” Reds, and Mold Malady Remember, every time you open your barrel, you introduce air and potentially some undesirable spoilage organisms. Article MEMBERS ONLY Alternative Sweeteners, Pomace Compost, and Stuck Fermentations If you add some kind of sweetener that is fermentable (table sugar, grape concentrate, maple syrup, honey, etc.) you risk an uncontrolled re-fermentation in the bottle, which is never fun.