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 language century in France, despite considerable Romanization. Coexisting with Latin, Gaulish helped shape the Vulgar Latin dialects that developed into French, with effects including loanwords and calques (including "oui", the word for "yes"), sound changes shaped by Gaulish influence, and influences in conjugation and word order. Recent computational studies suggest that early gender shifts may have been motivated by the gender of the corresponding word in Gaulish. The beginning of French in Gaul was greatly influenced by Germanic invasions into the country. These invasions had the greatest impact on the northern part of the country and on the language there. A