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Home | Category: Canning -- Miscellaneous Canning -- MiscellaneousWhat causes black deposit on the underside of canning jar lids after processing is completed?Rating: 100 Black deposits on the underside of canning lids of properly processed products do not mean spoilage. Naturally occurring compounds in food react with the metal in the lid to produce the black deposit. This is especially common in tomato products. The products are safe to eat.
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