User blog comment:Blakebellabootyy/late nights on RWBY wiki/@comment-9464517-20150728142911/@comment-4010415-20150728231356

Mercury is toxic, yes. It's poisonous if you swallow it, the fumes that come from it are toxic, and I think it might be dangerous to handle with your bare hands but I'm not sure.

Nightshade is also dangerous, as nightshade berries are poisonous.