How did the roman make face masks of the dead royals what materialor mineral did they

A death mask is an image, typically in wax or plaster cast made of a persons face following death, often by taking a cast or impression directly from the corpse. Death masks may be mementos of the dead, or be used for creation of portraits. It is sometimes possible to identify portraits that have been painted from death masks, because of the characteristic slight distortions of the features caused by the weight of the plaster during the making of the mold. In other cultures a death mask may be a funeral mask, an image placed on the face of the deceased before burial rites, and normally buried with them. The best known of these are the masks used by ancient Egyptians as part of the

Stone or bronze would be your answer!

Hey here is your answer