It wasn't just wallpaper - virtually anything that was green in that period was done with arsenic. There was also this tragedy (arsenic included among others):

It wasn't just wallpaper - virtually anything that was green in that period was done with arsenic. There was also this tragedy (arsenic included among others): https://www.racked.com/2018/3/29/17156818/19th-century-mourning-veil https://www.racked.com/2018/3/29/17156818/19th-century-mourn...