[1] Although the term is widespread in popular culture,[2] there is no scientific evidence that ectoplasm exists[3][4][5][6] and many purported examples were exposed as hoaxes fashioned from cheesecloth, gauze or other natural substances.
[10] Arthur Conan Doyle described ectoplasm as "a viscous, gelatinous substance which appeared to differ from every known form of matter in that it could solidify and be used for material purposes".
[13] The idea of ectoplasm was merged into the notion of an "ectenic force" by some early psychical researchers who were seeking a physical explanation for reports of psychokinesis in sessions.
[14] Its existence was initially hypothesized by Count Agenor de Gasparin, to explain the phenomena of table turning and tapping during séances.
[17][18] This view was held by Camille Flammarion[19] and William Crookes, however a later psychical researcher Hereward Carrington pointed out that the fluid was hypothetical and has never been discovered.
[20] The psychical investigator W. J. Crawford (1881–1920) had claimed that a fluid substance was responsible for levitation of objects after witnessing the medium Kathleen Goligher.
Many mediums had used methods of swallowing and regurgitating cheesecloth, textile products smoothed with potato starch and in other cases the ectoplasm was made from paper, cloth and egg white or butter muslin.
[29] In 1907, Hereward Carrington exposed the tricks of fraudulent mediums such as those used in slate-writing, table-turning, trumpet mediumship, materializations, sealed-letter reading and spirit photography.
[32] Donald West wrote that the ectoplasm of Carrière was fake and was made of cut-out paper faces from newspapers and magazines on which fold marks could sometimes be seen from the photographs.
[34] Cut out faces that she used included Woodrow Wilson, King Ferdinand of Bulgaria, French president Raymond Poincaré and the actress Mona Delza.
"[36] Danish medium Einer Nielsen was investigated by a committee from the Kristiania University in Norway in 1922 and it was discovered in a séance that his ectoplasm was fake.
Poor lighting conditions also became an opportunity for fraud, particularly as faux ectoplasm was easy to make with a mixture of soap, gelatin and egg white, or perhaps merely well-placed muslin.
The famous photograph taken by Hamilton of medium Mary Ann Marshall (1880–1963) depicts tissue paper with a cut out of Arthur Conan Doyle's head from a newspaper.