There are four main methods of sparkling wine production. The first is simple injection of carbon dioxide (CO2), the process used in soft drinks, but this produces big bubbles that dissipate quickly in the glass. The second is the Metodo Charmat, created by a French vine grower in Saint-Pourçain-sur-Sioule, in which the wine undergoes a secondary fermentation in bulk tanks, and is bottled under pressure. This method is used for Prosecco and Asti in particular, and produces smaller, longer-lasting bubbles. This is now used widely around the world to produce light, delicate sparkling wines. The third method is the traditional method or méthode champenoise. With this method the effervescence for more complex wines is produced by secondary fermentation in the bottle. As the name suggests, this is used for the production of Champagne and other quality sparkling wines, but is slightly more expensive than the Charmat process. The fourth method is the "transfer method". This method will take the cuvée to bottle for secondary fermentation, which allows for the additional complexity, but then will transfer the wine out of the individual bottles into a larger tank after it has spent the desired amount of time on yeast.
Read more about Sparkling Wine Production: Harvest and Primary Fermentation, Traditional Method, Other Methods, Bottle Aging, Vintage Vs. Non-vintage, Wine Faults, See Also, Notes
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