© William H. Mumler, ca. 1868, "Master Herrod in a Trance. His Spiritual Body Withdrawn and Appears Behind", carte de visite
'Spirit photography' is a type of photography whose primary attempt is to capture images of ghosts and other spiritual entities, especially in ghost hunting.
It was first used by William H. Mumler in the 1860s. Mumler discovered the technique by accident, after he discovered a second person in a photograph he took of himself, which he found was actually a double exposure. Seeing there was a market for it, Mumler started working as a medium, taking people’s pictures and doctoring the negatives to add lost loved ones into them (mostly using other photographs as basis). Mumler’s fraud was discovered after he put identifiable living Boston residents in the photos as spirits.
The May 8th, 1869, issue of Harper’s Weekly Magazine reported, "If there is a trick in Mr. Mumler’s process it has certainly not been detected as yet. To all appearances spiritual photography rests just where the rappings and table-turnings have rested for some years. Those who believe in it at all will respect no opposing arguments, and disbelievers will reject every favorable hypothesis or explanation."
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