Arsenic was widely known as a deadly poison for centuries, particularly among the wealthy and royalty. Over the years it has become known as the Poison of Kings, and the King of Poisons. The French tyrant Napoleon Bonaparte died of arsenic poisoning. For years people assumed his death was the result of murder. However, some chemists think the arsenic came from the wallpaper in the room in which he died. It contained a popular green pigment made from...