That's what John Ramsey calls it in DOI p 373. It "grew" on the floor and walls of the moist, warm, windowless room. <P>Regardless of what it was, it changed shape with time because it "grew". Prints left in it would change shape and be obliterated as the mildew/fungus/concrete-dust/mold.<P>Therefore, the prints made in the material on the floor were "fresh".<P>There is also the consideration that LHP and some of her family had been in the room about 3 weeks before but none of their footprints were apparentley still left when the floor was photographed as a crime scene.