How many poisons are there lurking in museums? A lot. But mostly it's arsenic. From taxidermy to cosmetics, arsenic is everywhere! But the most striking examples are the beautiful pigments and dyes made from arsenic. This week on Curio, Shan informs Jaybee of the deadly dresses, sinister wallpapers, and killer books that hide in museum collections. And the Milkshake Murder. And William Morris! Be careful when handling old green stuff: turns out a lot of it can kill you.