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A collection of Mason jars filled with preserved foods. A Mason jar, also known as a canning jar, preserves jar or fruit jar, is a glass jar used in home canning to preserve food. It was named after American tinsmith John Landis Mason, who patented it in 1858. The jar's mouth has a screw thread on its outer perimeter to accept a metal ring or ...
Prior to 1933, Ball was the largest domestic manufacturer of home canning jars. In 1939 it manufactured 54% of all the canning jars made in the US. A drop in demand for the jars during the 1930s led the Ball brothers to begin manufacturing other types of jars and bottles for commercial use, and eventually expanding into other lines of business.
In North America, home canning is usually done in Mason jars, which have thicker walls than single-use commercial glass jars. Unless the food being preserved has a high acid content (pH <4.6) or salt or sugar content resulting in water availability <0.85, such as pickles or jellies , the filled jars are also processed under pressure in a canner ...
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The glass jars come in a variety of shapes and sizes, have rubber seals, glass lids, and stainless steel clips.. Food is processed in Weck jars using the water bath canning technique, not a pressure canner.
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