This  is the very energy, substance used by the spirits during the seance to form hands, even full body materialization. Seen here the ectoplasm comes from the ear and begins to form a hand  photographed in Switzerland

Ectoplasm is by default, light much light and it stops, not enough and it becomes harder to produce...Photographed in Toronto CA

" People ask me, How is all this even possible, and to be honset I can understand why.  Many claim to know all about this substance, yet the same many will tell you it can not be touched, thought a quick search of the history will show you it can and has been for many years. "