(I forgot to post this with the other stuff, so here you go.)
Remember, when I wrote about the color red, and how freaking toxic a lot of the red paints in history were, what with the mercury and sulfur contents? (If not, the post is available on the sidebar, under "Color".) Well. It appears that red paint probably claimed the lives of a few monks over the years, who used it for illuminated manuscripts.
Food color is looking better and better, all the time.