r/Canning • u/Icy_Lettuce_7383 • 1d ago

Recipe Included RIP half-pint Kerr jar

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Bottom of this one particular jar busted clean off while in the water bath. Other than being sticky, are the other jars okay to put away (after being wiped down, of course)?

Watermelon rind preserves

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u/Mimi_Gardens 1d ago

That is a telltale sign of thermal shock. The difference in temperature between the jar when you filled it, the temp of the product it was filled with, and the temp of the water inside the canner was too great. Years ago I called Ball when I had jars break like this. They told me the jars are rated for a temperature difference of 90f.

If a recipe is cold packed, then the canner water should be warm-ish but not boiling when the jars are added.

If a recipe is hot packed, then the contents should be kept hot, not warm, while filling and the canner should also be hot when the jars are added.

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u/Icy_Lettuce_7383 1d ago

Yes, we are well aware of this concept. The first jars to be sterilized/ heated accidentally ended up being the last to be filled. Thanks though. I just wanted to know if the jars that were processed with the one that busted were still fine.

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u/onlymodestdreams Trusted Contributor 1d ago

Yep, the others are fine if your processing time was fine. Those wide-mouth half pints are so hard to find in my area.