Vinegar (the word means bad wine) is produced by exposing a fermented beverage like beer, wine, or watered down whisky to oxygen. The subsequent growth of the little worms or a mother is incidental to the making of vinegar not the cause of it.Natural, ACV, with the mother is cultured from the microbes that occur from the surrounding environment.
Incidentally air locks protect wine from oxygen and the co2 in a barrel of beer forms a protective layer or barrier that overlies the beer.
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