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I just bought a new case of Kerr pint widemouths, which all jars look good. I can use those as a control for now. I showed a friend and they said they had a few like that too after looking. At least it's not just me :smile:

Thanks for the replies. The jars get used for water canning pressure/water bath and always used a rack. The widemouths also got got used for freezing. I am just going to toss them after reading a bunch on it. I really just found it weird that I have like 20 jars with this similar crack in...

Hello, new to the forum here. I haven't found anything online about this so I figured I'd give a forum a shot. I recently noticed a strange curved crack on the bottom (near the center) of one of my canning mason jars. It's only on the outside and doesn't seem to go through to the inside. I...