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Asked by homecanning - 4 years ago
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Goldfish446 Level 3
Answered 4 years ago
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It could be you didn't have enough liquid in the jar to cover them, but as a matter of safety I would suggest any canned goods that are discolored should be thrown out and not eaten.
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Hecate Level 46 / Therapist
Answered 4 years ago
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Tin tomatoes or any tin product that changes colour is the result of oxygenation. Perhaps they have not been processed correctly or maybe there is a small whole in the can that as allowed air to get in, and therefore bacteria.

Throw away if this happens to you.
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