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Identifying old vs new clear Pyrex?

May 2 2012 at 6:42 AM
LisaCNC  (Login Straitlover)
The Frugalista Files

The Pyrex name and formula was sold to another company in 1998. They have since changed the formula, and those are all the ones that have been exploding in people's ovens, kitchens, etc. I have a few pieces that I know are the new stuff, so I will no longer use them in the oven or microwave, just the fridge. However, I have a few that I don't recall when I bought them. Does anyone know if there are any identifying marks on Pyrex to know when they were made or who made them???

I also want to know in case I see some at a yard sale or flea market. I know the colored stuff (milk colored w/ colored exteriors) is all pre-1998.

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