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Canning -- Jams and Jellies
Why did my jellied fruit product ferment, and what do I do?
Jellied fruit products may ferment because of yeast growth. This can occur if the product is improperly processed and sealed, or if the sugar content is low. Fermented fruit products have a disagreeable taste. Discard them. Source: Original FAQ posted at http://220.127.116.11/faq/FAQ_home.php