Blue Mason Jars do not 'turn' blue, they are manufactured from a greenish/bluish glass. This glass contains trace amounts of Iron and/or Cobalt ... the greater the concentration, the deeper the color.
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Yes. Glass has been around for about 9000 years and glass bottles were produced 3500 years ago. The Jamestown settlers made glass bottles and jars in the early 1600s. Glass jars for preserving food were sealed with a flat tin lid and wax until 1858 when John Mason invented the Mason Jar with a screw-on lid. By 1864 a glass jar would look very similar to a modern peanut butter jar.
There are numerous websites where you can buy canning jars wholesale. Try a Google search.
Mason is the company that manufactured many of the glass jars used to "can" produce. Now that very few people preserve their own food, many of these jars are now collectible. Mason Jar is the shop or amenity and food and drink service business, in Houston, Texas
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Glass jars can be made into many colors.
Yes, the microwave safe symbol is typically present on mason jars.
The Mom's Mason jars were made in 1975. They were manufactured in Columbus, Ohio and are worth between $1.00 and $2.00.
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If it is a blue glass jar than it is an old one. They used those jars to store many things from foods to poisons during the civil war. Also, check the lid if it has one. Metallic lids were used on the older mason jars. I have also heard that if the jar doesn't have a seam going down the side of it, it is one of the oldest models that mason produced. They hand blew jars before machine glassing them.
Small glass spice jars can be embellished in many ways. Glass paint and puffy paint could be used to give a stained glass effect. The jars could also be etched with a pretty pattern. A simple idea is to use hot glue to attach dried flowers, ribbon or just about anything small and light. A good way to get ideas would be to visit a local craft store.