
10/15/07, 11:28 AM
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Join Date: Aug 2007
Posts: 35
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A bacteria called Acetobacter lives by consuming ethanol and outputing acetic acid. The bacteria occurs naturally everywhere (in the air, on your counter, and in raw apple juice).
Your cider probably started a natural fermentation from the ambient yeasts in the juice. I would guess there is also a community of acetobacter waiting to take off once the yeasts produce any alcohol.
The acetobacter requires the presence of air to live. When your cider is done fermenting, cover the mouth of the container with a paper towel attached with a rubber band. Set aside in a warm place (ideally betwen 75 and 80 degrees Fahrenheit).
In a couple of weeks you should smell a sharp, pleasant, acidic aroma as well as see a thin, slimy film grow on top of the cider. That film is the "mother of vinegar". It is a great indicator that the bacteria is doing its job. The vinegar will be completely converted in 6-8 weeks.
If you don't want to rely on nature to infect your cider, you can add an exisiting mother of vinegar to your hard cider to get things going. If you have ever purchased an unpasteurized, unfiltered cider vinegar, the goopy stuff floating in the cider is the mother.
Brian K
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