A few refs:
Pink prison experiments
https://en.wikipedia.org/wiki/Baker%E2%80%93Miller_pink
Arsenic in wallpaper https://en.wikipedia.org/wiki/Scheele%27s_green#Illness_associated_with_arsenic_containing_wallpaper
Counterfeit mummies
"Inevitably, abuses quickly crept into the mummy trade. When “genuine” ancient mummies became too scarce or difficult to obtain, suppliers coped with the demand by resorting to using the corpses of condemned criminals. In his History, Pettigrew explains how French physician Guy de la Fontaine, physician to the king of Navarre, investigated the mummy trade in Alexandria in 1564. When he looked into the stock of mummies held by the chief dealer there, he found that the supply was substantially augmented by preparing the bodies of the recently dead, often executed criminals or slaves, by treating them with bitumen and exposing them to the sun, to produce mummified tissue which was then sold as authentic mumia."
https://www.artinsociety.com/the-life-and-death-of-mummy-brownl.html quoting from Pettigrew, T J, A History of Egyptian Mummies. Longman, London, 1834.