What's the Difference Between PYREX and pyrex?

What's the Difference Between PYREX and pyrex?

There are two different types of Pyrex: all-caps PYREX, and all-lowercase pyrex. There’s a key difference between the two products, so if you have any in your kitchen, you’ll want to take stock of your collection — and if you’re thinking of investing in some, be mindful of what you’re purchasing.

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