Definition of Draft liquor (champagne) in wine
After blending, the wine is bottled with a liqueur de tirage (a mixture of sugar and wine) and a yeast (selected yeasts). The yeast attacks the sugar and creates carbon dioxide. The fermentation, which lasts about two months, is prolonged by an ageing period (15 months minimum in total). The bottle is capped (some rare vintages are capped with a staple and a cork).