4 ms·

Thanks, I'd never heard this before. Do you know of any sources for vintage Pyrex?

• wyclif 6y ago
  EDIT: I just found out that one of the ways to distinguish the earlier, borosilicate Pyrex is that the earlier versions are labeled in all-caps: PYREX.
  • quercusa 6y ago
    The new stuff is also noticeably greener (e.g., look down the side of a measuring cup so you are looking through as much glass as possible).