Making Vinegar

The transformation of wine or fruit juice to vinegar is a chemical process in which ethyl alcohol, from fermentation (see: Making alcohol, above) undergoes partial oxidation that results in the formation of acetaldehyde. In the third stage, the acetaldehyde is converted into acetic acid, which is the basic ingredient of vinegar. Read more: http://www.madehow.com/Volume-7/Vinegar.html#ixzz5YNVgTeul