'The presence of arsenic is not uncommon in antique artifacts. The element is prevalently found in green pigments that were once used to dye clothing, book covers and even artificial flowers, according to Ms. Ritchie. (In the Victorian era, she said, people even ate small amounts of the toxin, hoping to make their skin appear pale.)'
HT @mucida

https://www.nytimes.com/2023/09/23/science/museums-taxidermy-arsenic.html