I have always wondered, how can a weapon like the Dagger of Venom could have unlimited charges? Obviously it can't work like bug spray, which would eventually run dry. So how does it work? It turns out there is a famous poison based on the element Thallium, which is sometimes found in iron ore. Thallium is pretty deadly when ingested, and it can also easily get you through your skin! An iron blade with a high Thallium content would be quite a weapon.
But if you get pricked, do not despair! There is an antidote of a most unusual nature. Have you seen a photo of Vincent VanGogh's "Starry Night"? That painting uses the pigment "Prussian Blue", which just so happens to absorb Thallium and will take it right out of your body. So if you do get poisoned, you can either eat a VanGogh painting if you happen to have one, or take a stiff drink from the Prussian Blue bottle. Voila.
