@cjust delicious. I made a prop once, for a pilot I was show running, out of an old cookie dough container with playground sand in it, but labeled with radiation symbols and "polonium-210."
It is in a storage unit, with other props too, inside a box with this disclaimer. I think if somehow firefighters came upon it, if god forbid their were a fire or something, they might help? I figure if the props survives, the disclaimer will as well.
I'm on that list too.