Secondary Fermentation
There are several methods used to carry out this secondary fermentation. The most well known is the Traditional or "Champagne method" where the base cuvee is bottled with a mixture of sugar and yeast. The introduction of a fresh yeast and food source (the sugar) triggers the fermentation process in the bottle that the wine will eventually be sold in. Through the process of riddling and eventually disgorgement, the dead yeast cells (lees) are removed from the wine while still maintaining the dissolved carbon dioxide gas. A dosage mixture of fresh wine and some sugar syrup is used to adjust the sweetness level of the wine after it has been disgorged. In the methode ancestrale the disgorgement step is skipped and the wine is sold with the lees still present as sediment in the wine. In the transversage method, after the wines have gone through the traditional method including riddling and disgorgement, the bottles are emptied into a large tank where they are then transferred to small and large format wine bottles such as 3 liter jeroboam and small split sizes used on airlines. Numerous quality producers worldwide use the "Traditional" method to make their sparkling wines.
The Charmat method takes place in stainless steel fermentation tanks that are pressurized. The fresh yeast and sugar mixture is added to the wine which rapidly stimulates fermentation in the pressurized environment. The wine is then cooled, clarified and bottled using a counter pressure filler. The process of carbon injection (or carbonation), the method used to make soda pop fizzy, does not involve initiating a secondary fermentation but rather injecting carbon dioxide gas directly into the wine. This method produces large bubbles that quickly dissipate and is generally only used in the cheapest sparkling wines.
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