I stumbled across this video on youtube. It's pretty technical, but utterly fascinating. This dude is talking about making batches of photochromatic boro glass. Melting the chemical and making glass from scratch.
Some of the stuff he talks about is stuff that we've learned from working with glass and come as second nature - other things he talks about are - well - just plain cool. I have never thought of glass as corrosive - but I wouldn't have put the ingredients into a mold, heated it up, and expected it to come out. However - I did not know that glass doesn't stick to platinum. (And I was unlikely to find that out by accident ... ).
I've had to watch it multiple times to get my head around some of it.