There used to be a paint made of ground- up Egyptian mummies. ‘Mummy Brown’ was a favorite color of many 19th-century European painters, but some people were so upset by its ingredients, they buried tubes of it in the ground out of respect for the dead. It was still being made up until 1964, when the manufacturer’s ancient mummy supply finally ran out. Source Source 2 Source 3

For example, much of this painting is made of ancient dead people: