Unlike a real, thick rubber seal, the ones on your tin lids will never return to their original fullness.| The Kerr Economy and Kerr Self Sealing jars were developed in 1903 by Alexander H. The first time a lid is used, the rim of the jar leaves it's indent behind. The primary reason you aren't supposed to reuse tin canning lids is because the seal is very, very thin. Along with the logo, you can sometimes use the color, size, and other distinguishing marks to help date a mason jar. There are many ways to date old Ball mason jars, and one of the easiest is to look at the logo. The company started making mason jars back in 1880, and many people today still use these for canning, or collect the jars as a hobby.The jars should not be used as bakeware, as most bakeware is tempered and can withstand greater. The jars are safe to use for home canning recipes, cold or room temperature food storage, crafting, and cold beverages. Rather, the mold number tells you where the jar was positioned on the glass-making machine that was used to produce it.| The glass used for Ball and Kerr canning jars is not tempered for oven use and is not meant to be used in baking projects. Mason developed the system of a threaded jar with a lid designed for sealing (he used lead lids with a rubber seal, not exactly the two-piece lid we know now, but very close).| 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. Canning jars, at least as we know them now, have been around since 1868. There's a New Brand of Mason Jars in Town + Giveaway.
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