Acids in wine responsible for the sour taste of vinegar. During fermentation, activity by yeast cells naturally produces a small amount of acetic acid. If the wine is exposed to oxygen, "Acetobacter" bacteria will convert the ethanol into acetic acid. This process is known as the “acetification” of wine and is the primary process behind wine degradation into vinegar. An excessive amount of acetic acid is also considered a wine fault. A taster's sensitivity to acetic acid will vary, but most people can detect excessive amounts at around 600 mg/l. Ascorbic acid, also known as vitamin C, is found in young wine grapes
Sparkling wine Rioja, Aragon, Extremadura) white or pink sparkling wine produced mainly in the Penedès region in Catalonia, 40 km to the south west of Barcelona, with the "méthode champenoise" but grape varieties different from grapes used in Champagne making. Cava is a Greek term that was used to refer to a "high end" table wine or wine cellar, and comes from the Latin word "cava" which means cave in English. Caves were used in the early days of Cava production for the preservation or aging of wine. Today Cavas have become integrated with Catalan and also Spanish family traditions and is