don't even come into contact with the selenium. IOW, don't let it touch your skin--use gloves, tongs, robots, kids, whatever to protect yourself. if i'm correct here, selenium is a cumulative heavy metel whereas most other photo chemicals are ok in moderation, although obviously none of them are going to do you any good.

but, yeah, selenium is one you probably don't want to even let come in contact with the kitchen sink.