My grandma cans marinara sauce and some of her jars were my great grand mother's (the blue ones.) I go there often, for sauce, and every time I'm lucky enough to get a blue jar I keep it and add it to my collection in my kitchen. My grandma says that they're tinted blue to help keep light out, putting off deterioration. It was wonderful to meet you this evening and I am so happy with the pram. You're a girl after my own heart, thanks!