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Canning -- Miscellaneous
Why did canned garlic in vinegar have mold on it?
Mold can grow on almost any food because it can withstand more acidic and dry conditions than can bacteria. Therefore, mold can grow on an acidified food. Mold, however, requires oxygen to grow. If the canning was done properly, the inside of the jar should be anaerobic (no oxygen). I think that the products were probably not processed for a proper length of time so that there was complete exhaustion of the air inside. The other problem might be that the lids that she used were old and so did not create a tight seal thus air was able to get into the jar and allow for the mold to grow.