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
Sour Grapes (2016 film) Sour Grapes (2016 film) Sour Grapes is an American crime documentary about wine fraudster Rudy Kurniawan. Filmmakers Jerry Rothwell and Reuben Atlas debuted the documentary at film festivals in October 2016 and on Netflix the following month. Rudy Kurniawan was a rich Indonesian wine collector with a fascination for Burgundy, and he spent millions of dollars on wine and also sold countless bottles of fake wine. Acker Merrall & Condit, an auction company, broke records by selling $35 million worth of Kurniawan's wines in 2006. In 2008, the firm held a sale at a Manhattan restaurant, promising the wines would