Thanks for this! My friend and I put those things to a test one day. We put one on a hammer head, then hit another one with it so it was “pearl-to-pearl”; the hammer just slid off, no matter how hard we smacked the thing, almost like they were covered in oil. Really weird feeling with what is still one of my favorite science toys.
“one of my favorite science toys.”
It sounds like fun!
I’ve never played with molten glass, but I have an ox-act torch and a nice anvil...