Wallpaper in the death room

[Lincoln Wonk]

During the Surratt Society conference, Erik Jendresen mentioned that the wallpaper in the death room was not brown and beige, but green and a lighter color. This is really interesting.
Erik or anyone, do you know who discovered that and when or what info it's based on? Do you know of someone who could confirm?
(I'm researching the room, and a green wallpaper would make a huge difference in the ambience in such a tiny room.)
Thanks,
Kathy Canavan