Vinegar is an acidic liquid processed from the fermentation of ethanol in a process that yields its key ingredient, acetic acid (also called ethanoic acid). It also may come in a diluted form. The acetic acid concentration typically ranges from 4 to 8 percent by volume for table vinegarFDA: Sec. 525.825 Vinegar, Definitions - Adulteration with Vinegar Eels (CPG 7109.22) (typically 5%) and higher concentrations for pickling (up to 18%). Natural vinegars also contain small amounts of tartaric acid, citric acid, and other acids. Vinegar has been used since ancient times and is an important element in European, Asian, and other traditional cuisines of the world.

The word "vinegar" derives from the Old French vin aigre, meaning "sour wine". It is also known as acidity regulator E260.

Density

Vinegar has a density of approximately 0.96 g/mL. The density level depends on the acidity of the vinegar. Household vinegar used for cooking is 1.05 g/mL.

History

Vinegar has been made and used by people for thousands of years. Traces of it have been found in Egyptian urns dating from around 3000 BC. According to Shennong's Herb Classic, vinegar was invented in China during the Xia Dynasty, around 2000 BC.

In the Bible, it is mentioned as something not very pleasant (Ps. 69:21, Prov. 25:20), but Boaz allows Ruth to "dip her piece of bread in the vinegar" (Ruth 2:14). Jesus was offered vinegar or sour wine while on the cross (Matthew 27:48; Mark 15:36). In Islamic traditions, vinegar is one of the four favored condiments of the Prophet Muhammad, who called it a "blessed seasoning".

In 1864, Louis Pasteur showed that vinegar results from a natural fermentation process.

Production

Vinegar is made from the oxidation by acetic acid bacteria of ethanol in wine, cider, beer, fermented fruit juice, or nearly any other liquid containing alcohol.

Commercial vinegar is produced either by fast or slow fermentation processes. Slow methods generally are used with traditional vinegars and fermentation proceeds slowly over the course of weeks or months. The longer fermentation period allows for the accumulation of a nontoxic slime composed of acetic acid bacteria and soluble cellulose, known as the mother of vinegar.

Fast methods add mother of vinegar (i.e. bacterial culture) to the source liquid before adding air using a Venturi pump

Malt

Malt vinegar is made by malting barley, causing the starch in the grain to turn to maltose. Then an ale is brewed from the maltose and allowed to turn into vinegar, which is then aged. It typically is light brown in color.