Stainless Steel and Cold Fermentation
California winemakers were early to adopt stainless-steel fermentation tanks and fittings, one of the major innovations in 20th century winemaking. Stainless-steel tanks were easily cleaned and prevented bacteria from spoiling wine. Fitted with temperature-monitoring metal jackets, they also allowed more control over the temperature of the wine during the fermentation process. Winemakers discovered that stainless-steel tanks produced a more stable, flavorful result, especially with white wines.