This piqued my curiosity and is something well outside of my normal hobbies/interests (conservation of old books or antiques, physical library spaces in general, etc), so I was curious who started it. Turns out the answer is Dr Melissa Tedone - Lab Head for Books & Library Materials Conservation at Winterthur Museum.<p>She had been reading a book about arsenic-containing wallpapers in Victorian-era England, and connected mental dots while examining a book entered into the museum with a microscope. Pretty fascinating stuff: <a href="https://www.youtube.com/watch?v=6jH1niN3NpU" rel="nofollow">https://www.youtube.com/watch?v=6jH1niN3NpU</a> the backstory starts around the ~1:40 mark