One of the oldest ways of preserving food was canning. It appeared before the refrigerators appeared. And when people talk about home canning, they actually mean preserving food in glass jars. And the typical jar used for these purposes is the Mason jar. It is called after its inventor John L. Mason, but he didn’t invent the glass jar. He designed the metal lid that could screw on glass jars and made it possible to preserve food in the jars.
There are three parts in the canning Mason jars. The first part is the glass jar. There are typically two styles of jar, which are regular and widemouth. Usually, the glass jars are clear, but there are also colored versions. Aqua is very common color but you can find jars in almost any color. Some people even collect antique Mason jars and the colored jars are the most valuable because they are rare.
The metal screw-on ring is the second part of the Mason jar. It is not that important and some experienced canners can store their jars without the rings. The ring is there only to protect the center portion from knocking off and it is not responsible for sealing the jar. Or if the seal breaks, the ring will prevent the contents of the jar going all over the place.
The third part of the Mason jar is the center cap. This metal center cap has kind of a rubber sealing compound, which has a sealing function and keeps the food fresh for a long time. So, this piece is what seals the jar and the metal ring is only for center lid protection. Many people get rid of the ring while storing because it may hide a bad seal and they also tend to corrode. When you store your canning jars without the ring, you can quickly define if the seal is bad.
It is important to make sure the seal is good and it is safe to eat the food inside the jar. If you have any doubts about that or the seal might have been broken, that food belongs in the garbage. You shouldn’t risk the health of you and your family. You can find a lot of information about how to define the integrity of the seal, but if you have the slightest doubt, get rid of that food.
The bail closure is also very popular kind of lid for the Mason jars. The bail closure has a metal wire clip that holds the lid down and shut, when closed. This is not the most common form of lid, but it is still used by many people.
Mason jars are great for preserving food and many people use them for canning food and filling their food storages with them.
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