Is there a simple way of distinguishing borosilicate glass from the cheaper soda-lime stuff? Both go under the name Pyrex, but the borosilicate ones are much more resistant to thermal shock than
![The new Pyrex glass formula versus the old Pyrex glass formula. The new is on the left, the old is on the right. If you ever in a thrift store and are The new Pyrex glass formula versus the old Pyrex glass formula. The new is on the left, the old is on the right. If you ever in a thrift store and are](https://i.redd.it/ha6ylhdultt61.jpg)
The new Pyrex glass formula versus the old Pyrex glass formula. The new is on the left, the old is on the right. If you ever in a thrift store and are
![Vintage Pyrex bowls may be worth big bucks as collectors hunt high and low for nostalgic dishes | Fox News Vintage Pyrex bowls may be worth big bucks as collectors hunt high and low for nostalgic dishes | Fox News](https://a57.foxnews.com/static.foxnews.com/foxnews.com/content/uploads/2023/03/1200/675/pyrex-split.jpg?ve=1&tl=1)