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Canning Jars Have Visible Residue After Processing?

Some canning jars have a residue around the lips of the jars after the hot water bath. The lids appear sealed. Is the product safe to eat?

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Gold Post Medal for All Time! 677 Posts
October 6, 20190 found this helpful

You may have overfilled the jars. You need to give headspace. I would use the jars with the residue as quickly as possible. Refrigerate them.

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Bronze Feedback Medal for All Time! 196 Feedbacks
October 7, 20190 found this helpful

Is the residue the color of whatever you canned--like it was overfilled? If so, I would not use those as there is no way to tell if the seal is complete since there may be residue under the seals and even if they popped, they could be not sealed properly.

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Since it has probably been at least 24 hours since this was done, I personally, would toss it. I got very sick from improperly canned items once and really preach a huge dose of care and safety in canning.

If it is white residue (like water spots)--it could be from hard water and the canning process itself and it is not harmful, but I would open, wash it off, and then store in the fridge and use within a week or two.

To prevent the white residue, some people use vinegar in their water. I can't tell you how much...that is based on how hard your water is...start with a few tablespoons and increase until the problem goes away.

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Bronze Post Medal for All Time! 105 Posts
October 10, 20190 found this helpful

This can happen if the jars are overfilled or the tops are not cleaned off. This should not be an issue, but to be on the safe side store the few jars you have in the refrigerator and try to use them up in the next few weeks.

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You can also give one or two of these jars to your friends.

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Bronze Post Medal for All Time! 140 Posts
October 11, 20190 found this helpful

The seal is compromised, meaning they will not last a season, therefore time for creative meals within the next couple of weeks, providing you keep refrigerated.Time for good eating!!!

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Gold Feedback Medal for All Time! 949 Feedbacks
October 13, 20190 found this helpful

The canning process can be tricky sometimes and if not paying close attention to '"everything" (or fairly new to canning) something can go wrong and we may have to consider - should I chance it??

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I would say to refrigerate these jars and if what is canned can be placed on high heat for several minutes then consider using it but check it carefully.

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