The rumor that the banished to the Atlantic island of St. Helena Napoleon (1769 - 1821) fell victim to a treacherous poisoning, has long persisted. A posthumous investigation of the Corsican's hair underpinned the suspicion of a murder plot - their extremely high levels of arsenic could have brought down an elephant. Recent laboratory analyzes, however, have recently directed speculation about arsenic theory in a very different direction. Napoleon was not a poison victim, but at the age of 51 years most likely succumbed to a stomach cancer.
Arsenic: poison and preservative
Arsenic was used in the 19th century for the preservation of leather, skins and hair. And also the "relics", that is to say the imperial hair, should have been treated with arsenic in order to save them from decay. This assumption is that hair from different periods of Napoleon's life was kept and analyzed - with amazing results! The relatively uniform concentration of the poison on all hair specimens suggests that Napoleon did not take the arsenic orally (through food or beverage), but that it was applied - most likely after his death - for conservation purposes from the outside.
Opponents of this theory, however, the lack of DNA analysis, as a sure proof of authenticity, in the field. If that's true, the hair of God knows what hair.