[ljnelson]

You want to make sure you're using PYREX, not pyrex. They're different![1]

[1]: https://www.allrecipes.com/article/what-is-the-difference-be...

[mitthrowaway2]

The biggest difference is that the latter is the only one you'll find in stores, at least in north america.

[jchook]

Unreal that this very misleading branding was allowed to continue.