Natural wines are made from grapes that come from organically worked vineyards (whether or not they've been certified as such) that have been harvested by hand. During the vinification period, there is minimal intervention -- no added commercial yeast, acid, sugar, enzymes, bacteria and tannins, and only naturally occurring sulfites. Sulfites are controversial, with purists swearing off any added sulfur dioxide, and other natural winemakers ceding a bit of additional sulfites at bottling (though still far less than conventional winemakers). Natural wines are also produced without common modern technologies like reverse osmosis and micro-oxygenation, which tweak the texture of the wine and add either flavor or alcohol.
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