A death mask is a likeness (typically in wax or plaster cast) of a person's face after their death, usually made by taking a cast or impression 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.