It ensures you’ll get the processing time right and wind up with the best results.īestReviews What features do canning jars have? Jar size If you’re following a canning recipe, stick to the jar size in the instructions. Also make sure that any jars you consider are food-grade so they don’t contain any lead or other toxins that could leach into your food. This type of glass won’t break when exposed to the high temperatures and pressure that canning requires. Wide-mouth jars are also easier to clean than regular-mouth jars, but they’re sometimes difficult to seal.Ĭanning jars should be made of thick, tempered glass. They can fit larger fruits and vegetables and are suitable for freezing because they have enough space for the liquid inside to expand when it freezes. The opening is typically three inches wide. Wide-mouth jars have the same width at the top and bottom of the jar the sides are straight. Regular-mouth jars shouldn’t be frozen, because they don’t have enough space for the liquid to expand when it freezes. Larger fruits and vegetables may not fit inside the narrower opening. This design helps keep the food below the liquid level and works well for small and pourable foods, such as pickles, chilies, salsas, jams, and jellies. The opening usually measures 2 3/8 inches wide.
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