QuilotoaTIL at one time, people thought that tomatoes were poisonous.
It is toxic if you cooked in a copper pot because of its acidity, which a lot of people had.
Copper might do it too, I read about pewter, which is a lead alloy. Copper poisoning is serious business too. Telltale signs are green rings around the eyes. It fucks with your reproductive organs amongst other things, in a non fucking sort of way if I recall.