Spirit photography
For seventy years photographers sold portraits with the sitter's dead relatives standing behind them. The medium was new enough that its failure modes looked like the afterlife. It was double exposure, and the market for it was grief.
Why this verdict
Debunked by controlled test and by demonstration: Harry Price caught William Hope in 1922 by supplying secretly marked photographic plates and getting back plates that were not the ones he had given, and every spirit photograph examined under conditions the photographer did not control has resolved to double exposure or plate substitution.
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01The claim
That photographic plates could capture the images of the dead standing with the living — and, in the developed form the Spiritualist movement defended, that the medium provided objective mechanical evidence of survival after death, immune to the credulity that dogged séance testimony.
02Where it came from
William H. Mumler, a Boston engraver, produced the first in 1861 and found he could sell them. The timing was not incidental: the American Civil War had killed three-quarters of a million people, many of them buried where they fell, and Spiritualism was already growing. Mumler's most famous plate shows Mary Todd Lincoln with a figure resembling her husband resting his hands on her shoulders. The practice crossed to Britain and continued through the First World War and its aftermath, where William Hope and the Crewe Circle served a second bereaved generation and were defended in print by Arthur Conan Doyle.
03What the record shows
✕ DEBUNKED — Investigated and refuted. Here is what actually happened.
The mechanism was never mysterious to photographers. A plate that has been previously exposed and imperfectly cleared, or exposed twice, produces exactly the transparent superimposed figure that spirit photographs contain. Contemporaries demonstrated it constantly: at Mumler's 1869 fraud trial in New York, the photographer Abraham Bogardus produced, on request and in front of the court, a portrait of P. T. Barnum with the ghost of Abraham Lincoln. Mumler was acquitted — the prosecution could not prove which method he had used — and his business did not survive the demonstration.
The decisive test came from Harry Price in 1922. Investigating William Hope for the Society for Psychical Research, Price supplied photographic plates that had been secretly marked at the Imperial Dry Plate Company with an X visible only under examination. The plates returned from Hope's sitting carried spirit extras and did not carry the marks: they were not the plates Price had given him. Hope had swapped them.
The pattern across the whole history is the same and is the strongest evidence available: results appear when the photographer controls the plates, the camera and the darkroom, and stop when any one of those is taken away.
Several practitioners, including Hope, kept clienteles after exposure. Conan Doyle attacked Price rather than Hope, which tells you what the photographs were actually doing for the people who wanted them.
04What it cost
Spirit photography is the first mass instance of a pattern this archive documents repeatedly at larger scales: a new recording medium is trusted, briefly, at a level of confidence its failure modes do not deserve, and the gap is monetised before the public intuition catches up. It ran from 1861 to the 1930s, closed as film and printing became widely understood, and reopened with each subsequent medium — the Cottingley photographs, video, and now synthesis. The commercial base never changed either. Almost every customer was bereaved.