Lime is supposed to make pickles crisp. However, it does not work very well. The USDA no longer recommends the use of lime in homemade pickles.

Lime is not used in jam. Lime used to be used in pickles to make them crisp. However, the USDA no longer recommends using lime in food processing for home preserving.

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Vinegar is the natural product that preserves pickles. Lime does not preserve pickles it used to be used to provide crispiness. However, the USDA no longer recommends using lime.

USDA means U.S. Department of Agriculture