Ectoplasm is said to be produced by physical mediums when in a trance state. This material is excreted as a gauze-like substance from orifices on the medium's body and spiritual entities are said to drape this substance over their nonphysical body, enabling them to interact in our physical universe.
Ectoplasm is a term for a material coming out of a physical mediums's nose, ears & mouth. Any ectoplasm extruded forth from a bodily orifice by a physical-medium during s séance is typically re-absorbed into the same bodily orifice by that physical-medium during the same séance, either equally slowly as it was extruded or else more swiftly. A very swift re-absorption may be induced by sudden illumination of the scene (turning on the light or photo-flash), if the extrusion occurred in a totally darkened chamber. Not in all instances, however, is the extrusion induced in a totally darkened chamber (in which case the ectoplasm is often visible by means of its faint luminescence); in some instances (typically out-of-doors in a remote wilderness-site) it may occur in twilight, at dusk. Broad daylight, or even steady illumination (for photographic purposes) by infra-red or by ultra-violet illumination, does not appear to be known as conducive to observable (viz., to multiple ordinary observers) ectoplasmic extrusions. Indeed, even twilight manifestations of ectoplasm seem to occur only in the presence of a party of experienced psychic sensitives, and not in the presence of mere casual non-committed extraneous observers.
Although the term is widespread in popular culture, the physical existence of ectoplasm is not accepted by mainstream science. Some tested samples purported to be ectoplasm have been found to be various nonparanormal substances, including chiffon and flakes of human skin. Other researchers have duplicated, with non-supernatural materials, the photographic effects sometimes said to prove the existence of ectoplasm.Source: WIKIPEDIA
