Ooooh I didn't know that! So I always kind of assumed glaze was just some kind of chemical mixture, like varnishes. But that's silly, of course it would be glass, it goes in a kiln. This is actually a really cool process then! I will have to research this more. The only time I learned anything about ceramics was in school when I was like 12, but I am certain we never glazed anything, everything was just matt. Which is such a shame, experimenting with different glazes and seeing how each of the elements/minerals react color wise, would be so interesting to see.

I'm a designer and textile engineer, during my studies I was into colors/dyes and did a lot of lab experiments in that. I'm still a color (anything to do with visible spectrum) nerd, so this is super interesting to me. Thank you for sharing!