1.  A viscous substance said to come from the spirit world. Usually milky white in color when visible, this substance, is claimed to be the means by which spirits produce poltergeist or telekinetic activity. Highly controversial during the heyday of séances, it would sometimes become physical by way of a “physical medium,” being exuded from her orifices, solar plexus, or fingertips. The substance is said to be “plastic,” that is, highly moldable, and can form faces, limbs, or complete human figures. Often accompanied by an acrid smell similar to ozone.