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The amount of alcohol by volume in a wine, specifically ethyl alcohol. Ethyl alcohol is the prominent alcohol found in wine. It is derived from the effect of yeast (natural or added) on the sugar content of grapes during fermentation. Required by law, alcohol level must be stated clearly on the wine label. The presence of alcohol is measured in percent by volume or "proof". For consumption purposes, the amount of alcohol or the lack of alcohol affects the character of the wine.