Fumes in general aren't that great in enclosed spaces. I've had a few, uh... 'gas' incidents before.

[Nevermind that it involved her friend and a bad case in indigestion instead of alchemy]

I really shouldn't be working on half this stuff indoors, either, but I've gotten in the habit of working wherever I can. Hard to find a workshop when you're traveling constantly.

[There's a closed bag on Velo's bed that probably smells faintly of sulfur and saltpeter.]