If you have a jar with one of the older logos, it will likely be worth more than one with a newer logo. Next is the color. Clear and pale blue are the most common colors, but jars of all colors were produced. Some of the rarest jars are antique green glass jars of certain shades, which can fetch up to $300.

Why are old canning jars blue?

Feeling Blue Those blue mason jars were mass produced until 1937 using sand from around Lake Michigan. It was that sand that gave the glass its blue hue.

Are mason jars and Ball jars the same?

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.

How can you tell how old a Kerr Mason jar is?

Check the jar from top to bottom. The Kerr name will be embossed on the glass. There are some general guidelines to approximate the date of a vintage Kerr jar between 1915 and 1930. The finish on a fruit jar can tell you roughly about the date it was made.

Can I reuse Classico jars for canning?

What did Classicos page say (before it was taken down) regarding Can I reuse the Classico jar for home canning? No. A coating is applied at the glass plant to reduce scratching and scuffing. This would increase the risk of the jar breaking when used for canning.

How can you tell if a canning lid is good?

The best way to tell if your lid sealed properly is to allow the jar to cool naturally to room temperature. Overnight is what I always do then remove the screw band and lift the jar by the edge of the lid. The lid should be able to hold the weight of the jar and will not come off.