Division 10 The carbon dioxide contained in the sparkling wines may be produced only as a result of the alcoholic fermentation of the cuvée from which such wine is prepared.

Such fermentation, unless it is intended for processing grapes, grape must or partially fermented grape must directly into sparkling wine, may result only from the addition of tirage liqueur. It may take place only in bottles or in closed tanks.

The use of carbon dioxide in the case of the process of transfer by counter- pressure is authorised under supervision and on condition that the inevitable gaseous exchanges with the carbon dioxide from the alcoholic fermentation of the cuvée do not increase the pressure of carbon dioxide contained in sparkling wines.