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
French wine styles of wine that have been adopted in other producing countries. Although some producers have benefited in recent years from rising prices and increased demand for some of the prestige wines from Burgundy and Bordeaux, the French wine industry as a whole has been influenced by a decline in domestic consumption, while internationally, it has had to compete with the increased success of many new world wines. French wine originated in the 6th century BC, with the colonization of Southern Gaul by Greek settlers. Viticulture soon flourished with the founding of the Greek colony of Marseille. Wine has been around