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Sometimes you boil the lids and sometimes you don't. If you are canning with either a hot water bath or in a pressure cooker, you do not need to boil the lids. If you are canning something that is put into the jar hot and is not going to be processed in the the bath or pressure cooker, you boil the lid to soften the rubber in the lid that forms the seal.

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Q: Why do you boil lids before canning when they will be boiled during the process anyway?
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