Jennifer,
I saw on your blog that you had gotten a couple of old blue jars in a box someone gave you. I thought I'd show you some of the ones that I have. My grandma had tons of them and had given me a few over the years. When she passed away we found more in her cellar. I have a full set of pint, quart and half gallon in blue for each of the kids. I have blue ones but I also have a green one and one that is purple. They are all either Ball or Mason.