sentences:  The second step was to confuse and replace the rare black exudation from embalmed corpses with the black bitumen that Egyptians used as an embalming preservative.The Baghdad physician Abd al-Latif al-Baghdadi (1162–1231) described ancient Egyptian mummies, "In the belly and skull of these corpses is also found in great abundance called mummy", added that although the word properly denoted bitumen or asphalt, "The mummy found in the hollows of the corpses in Egypt, differs but immaterially from the nature of mineral mummy; and where any difficulty arises in procuring the latter, may be substituted in its stead.