Cuve Close

Cuve Close – tank method or Charmat method.
A way to make sparkling wine.
A wine is made to ferment again by adding sugar and yeast.
This second fermentation produces a lot of carbon dioxide, CO2, which is held in a tank.
Because the carbon dioxide has no way of escaping it mixes with the wine.

The colder the tank, the longer the process takes: differing from 10 to 90 days.
The longer it takes, the better the integration of the carbon dioxide in the wine.