From the Harvard vault of rare pigments, Mummy Brown is very much what it sounds like:
People would harvest mummies from Egypt and then extract the brown resin material that was on the wrappings around the bodies and turn that into a pigment. It’s a very bizarre kind of pigment, I’ve got to say, but it was very popular in the 18th and 19th centuries.
I guess it’s marginally better than ending up as fertiliser? Although there might be fewer opportunities to wreak your revenge: