All the fine pigment powders and mica, probably. My lungs are fucked enough at it is and there's always a little cloud whenever I open a jar or go to decant any, and I never remember to mask up each time.

The turprntine and other oil paint solvents aren't too healthy to be breathing in either though.

And I've definitly slipped and burt myself with the soldering iron a few times now too. Oh, and the lead solder too actually now I come to think about it.

Also, I think cheap gold leaf tends to have a lot of lead in it too, doesn't it? I've got a fuck tonne of that lying about and on various things too.