That means that the Kerr Mason jars boast all of the tough American-made quality of their Ball counterparts, so you can buy with confidence. Like other Ball and Kerr jars, these are also safe for heating and freezing and are available in various sizes to suit your need.

Whats the difference between Ball and Kerr jars?

The same is true of glass jars. All the arguments about the difference in quality between one brand and another is only perceived differences. The glass is made in the same batch, the only differences are the molds - whether they say Ball or Kerr is only cosmetic.

Are Kerr jars worth anything?

Typical values: The value of antique Ball, Mason and Kerr canning jars varies greatly. Typical prics range from $8 to $25 a jar. Look at the books listed above on this page for more details about how to value a jar.

What is the difference between a Ball jar and a Mason jar?

A Mason jar is a molded glass jar that is originally used in canning to preserve food. Other common names for the original Mason jar include Ball jars (after the Ball Corporation), fruit jars and simply glass canning jars. All Mason jars are not created equal.

Why do Mason jars say Ball?

Mason jars are also called: Ball jars: in reference to the Ball Corporation, an early and prolific manufacturer of glass canning jars.

What does the number on the bottom of Ball Mason jars mean?

Many Ball mason jars have a number printed on the bottom of the jar, but this is a mold number that does not indicate the year of production. Rather, the mold number tells you where the jar was positioned on the glass-making machine that was used to produce it.

Why is there a glass jar shortage?

The runs on Mason jars tend to occur when there is some kind of economic instability, recessions, in wartime, basically, anytime that people start to freak out about where theyre going to get their food, if theyre going to have enough food, what is happening in the world.

What happens if you leave too much headspace when canning?

If too much headspace is allowed, the food at the top is likely to discolor. Also, the jar may not seal properly because there will not be enough processing time to drive all the air out of the jar.