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Canning -- Miscellaneous
If home canned foods have frozen during storage, are they safe to eat?
If the food was processed according to current home canning recommendations (see Canning Basics), and the jars are still vacuum sealed, the food should be safe to eat. Examine jars closely ? sometimes freezing can cause damage to the vacuum seal, or jar breakage. Home canned food that has been frozen during storage may be less desirable due to changes in texture, flavor, nutritional value and color. Source: Original FAQ posted at http://www.homecanning.com/usa/alfaq.asp