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You shouldn't use the older canning jars for several reasons. They may "explode" when the cool air hits the jar as you move it out of the hot water or at any time during the cooling down period. They may not seal well and the food could become contaminated or poisonous. The bottom could simply "fall off" in the water during the canning process, releasing the food within the jar out into the water. Also, the older jars were not made for pressure canning and may not withstand the pressure.

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11y ago
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10y ago

Crown canning jars that are vintage are probably not a good choice for canning. If there are nicks, scratches, or uneven glass at the rim of the jar they may not seal properly. They could also break during processing in a hot water bath. All in all it would be advisable to use modern jars and 2-piece lids.

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