At first glance, the cartonnage in Macclesfield Museum’s display of Egyptian antiquities seems like any other mummy-holding case. The cartonnage material is made of two or three thin layers of bandages applied on top of one another, with ancient glue holding them together. It’s “the Egyptian equivalent of papier mâché,” according to Ken Griffin, Egyptologist and Curator of the Egypt Centre at Swansea University. Its smooth surface, created by a thin layer of plaster, is painted with images to guide the deceased to the afterlife in shades of salmon pink,…