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canning jar lids, question

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I just purchased some new Ball canning jars at the grocery store. While I was in the car on the way home, I heard the tell-tale "ping," meaning the jars were self-sealing in the car! I know the actual jars are safe to use, but do I have to buy new lids?

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  1. Changes in air temperature will cause this...which of course is exactly what you're doing when you heat a jar to can something. I had a box of jars straight from the store with the lids and stored it near a baseboard heater and it took me awhile to realize it was the lids popping off when the heater came on!

    As far as I know the lids are reusable and as long as the wax on the bottom is intact they will be ok.

    1 Reply
    1. re: jzerocsk

      Lids are *not* reusable once they've been sealed to a jar. As kmr states below, if the wax is indented, best to buy a box of new lids. They're not expensive. I can get them for about $2 per box.

    2. Imgould - to be careful with your investment of food & time, canning lids are not re-used. If you look at the ring, you'll probably see that the rubber coating is indented where it sealed onto the jar. You risk the jar not sealing if you reuse.....me, I would use fresh unsealed lids.