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Canning -- Miscellaneous

Should I retighten lids on canning jars after processing?

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No. Do not retighten loose screw bands after the jars are removed from the canner. You will disturb the seal that began forming when the jar started cooling. This causes "cut throat," a condition where the jar rim cuts completely through the sealing compound to the enamel lid resulting in seal failure.

PREPARED BY: Angela M. Fraser, Ph.D., Associate Professor/Food Safety Specialist, and Carolyn J. Lackey, Ph.D., R.D., L.D.N., Professor/Food and Nutrition Specialist, North Carolina State University (August 2004)

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