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People who enjoy canning often pick up used jars at garage sales, thrift shops, and flea markets because they are inexpensive.They never suspect that they may be using a jar that is seventy-five years old.Kerr patented the first canning lids that had a permanently attached gasket, the type still used today.
Contribution of Kerr jars in modern food preservation method: Food preservation is a key task of most of the housewives for different reasons.They were clearly marked with a fill line to allow for head-space.They are straight sided in order to allow the frozen contents to be removed easily.If there is a mould seam it means the jar was made after 1915.Look for additional information to indicate modern Kerr jars. Typically embossed on the jar is the date of manufacture, plant location, job number, and other information. She is published online for a prominent San Francisco website and is a staff writer for Movie Magazine International, San Francisco.