![]() ![]() Shape and volume affect the rate of heating of the food in a jar. Other commercial jars with mouths that cannot be sealed with two-piece canning lids are not recommended for use in canning any food at home.”Īnother advantage of using canning jars is that they generally have a consistent shape and hold a consistent volume. Mayonnaise-type jars are not recommended for use with foods to be processed in a pressure canner because of excessive jar breakage. Seemingly insignificant scratches in glass may cause cracking and breakage while processing jars in a canner. These jars have a narrower sealing surface and are tempered less than Mason jars, and may be weakened by repeated contact with metal spoons or knives used in dispensing mayonnaise or salad dressing. However, you should expect more seal failures and jar breakage. “Most commercial pint- and quart-size mayonnaise or salad dressing jars may be used with new two-piece lids for canning acid foods. When jars and lids are used properly, jar seals and vacuums are excellent and jar breakage is rare. With careful use and handling, Mason jars may be reused many times, requiring only new lids each time. Regular-mouth decorator jelly jars are available in 8 and 12 ounce sizes. Half-gallon jars may be used for canning very acid juices. Wide-mouth jars have openings of about 3 inches, making them more easily filled and emptied. The standard jar mouth opening is about 2-3/8 inches. They are available in ½ pint, pint, 1½ pint, quart, and ½ gallon sizes. “Regular and wide-mouth Mason-type, threaded, home-canning jars with self-sealing lids are the best choice. They require special sealing equipment and are much more costly than jars. “Food may be canned in glass jars or metal containers. Home food preservation experts have worked with various types of canning jars and their experience is reflected in the following long quote from the National Center for Home Food Preservation. The major reason we recommend Mason-type canning jars is our experience with them and their decreased rate of breakage in comparison to mayonnaise jars, salad dressing jars, spaghetti sauce jars or other jars not intended for canning. ![]()
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