Read this: They maintained that the potassium tartrate used in his treatment prevented his stomach from expelling these compounds and that his thirst was a symptom of the poison. Their hypothesis was that the calomel given to Napoleon became an overdose, which killed him and left extensive tissue damage behind. According to a 2007 article, the type of arsenic found in Napoleon's hair shafts was mineral, the most toxic, and according to toxicologist Patrick Kintz, this supported the conclusion that he was murdered.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): What substance used in Napoleon's treatment is it suggested prevented his stomach from expelling arsenic compounds?
potassium tartrate