2. Ancestral Method: As the name suggests this was the first method that was used in making sparkling wine, and whilst it requires no additives or special technology it is a method that requires skill, careful observation and experience. It is also called PetNat (Petillant naturel in french) or Colfondo (in Italian, specifically in the Veneto region where this was used to make Prosecco)
The winemaking starts with the first fermentation of the base wine however the wine is bottled in the midst of the fermentation, still containing a relatively high level of sugar. The bottles remain in the cellar until the following spring and when the temperatures start rising the second fermentation takes place inside the bottle. You may find examples of a Colfondo Prosecco, Petnat and Ancestral