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Joe Sallustio
 
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Ok. You have some good leads in other posts but if it smells like
vinegar I guess it is. I don't know how it got infected though. As to
oxidation, another test is to check the shoulders of the wine in a
slanted glass, the perimeter should be clear and you should not see any
brown anywhere. Browning is an indication of oxidation.

Most store bought vinegar is dead, it was pastuerized. Live vinegar is
infected with a culture of acetobacter, it can grow more vinegar.

Joe