Yes aluminum too, and there is no way to get all of the crap out of a light bulb. Hell you might get a stray piece of glass from where you bashed in the end of the bulb. It's just not safe to put flame to treated glass and inhale the result. It's probably not in the how-to because: a. They don't know about it OR b. They just don't care. Allot of people look at it like they're already fucking up their lungs what damage could it do?