Ectoplasmic Residue  
Ectoplasm is the supposed residue left by spirits. Ectoplasm can take many forms, but it is often seen as a
yellow-green hue or ooze around a ghosts body.
Ectoplasm residue is often spotted in pictures, when a ghost interferes with a shot. It can also be spotted in the air, and
sometimes with a special flashlight or a pair of goggles. At times moving through ectoplasm has been "noted" to be the
cause of illness or possession.
Breathing or exuding it is a sign of being in contact with the supernatural world.  Some believe that ectoplasm is the
reason ghosts can materialize, the residue often marks a strange appearance or physical disturbance in a haunted
area.
It is possible the residue in photos are from magnetic fields emanating from the earth. Many mediums feel that
ectoplasmic residue is the movement of spirits disturbing magnetic fields around the earth. Whatever the reason
certain photographs are still waiting to be explained.

Ron Fulkerson