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What causes a lid to become corroded or rusted while it is on a jar of home canned food?

April 26, 2017canned causes corroded food Home jar rusted

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What causes a lid to become corroded or rusted while it is on a jar of home canned food?

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Following the manufacturer’s instructions for preparing and using lids will reduce the possibility of corrosion. It is also important to use home canning lids that have been stored in a cool, dry, dark place.