Most closures are packaged pre-sanitized, usually with sulfur dioxide in the sealed bags that come from the manufacturer.
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Get some pointers and considerations a winemaker needs to keep in mind when topping off your aging wine vessels. The Wizard also answers questions on fining agents and malolactic fermentation after cold stabilizing a wine.
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What is the best way to store oak barrels that don’t have wine in them? Get the answer from the Wine Wizard, as well as her advice for a case of oversulfited wine, removing white film from a glass carboy, and five tips for a rookie winemaker.