Bad effect of handling(burning) glasses?

Question

*I'm non native speaker of English. Sorry for my imperfect expression.

I would like to start learning "glass beads".

I got know the bad effect for eyes during burning glasses (with a small burner, though) because it emits harmful light rays. So I decided to prepare special glasses for eyes. However I don't know other kind of harmful effect for other parts of my body. I guess I heard bad effect for lungs or something but I don't know... Could something bad be emitted during burning glasses?

If so, how can I avoid the bad effect?

Answer 1

dangerous vocation ,