Discard any home-canned food with mold on or in the food. It could be dangerous. It is possible for mold growing on the surface to lower the acidity of the food. If the food becomes low enough in acid, botulism-producing bacteria can start to grow and produce toxin. Even if you scrape the mold off the surface, the toxin remains in the food. Molds, too, produce toxin so that you should discard the food.
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