. . . 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.
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Oxygen Ingression, Volatile Acidity Interventions, Sorbate Question, and Malolactic Timing
Sometimes we get several questions that revolve around a similar theme. The Wine Wizard had several questions this go-round on volatile acidity and malolactic fermentation. She provides some specifics for winemakers who have bigger picture problems on their hands.
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Yeast-free wine and quality control: Wine Wizard
The good news is that most wines that you can buy off the supermarket shelf don’t contain a lot of yeast cells; if they did, the wines would look cloudy and might even re-ferment in the bottle.