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The re-exposure to light of a developing negative or print produces a partial reversal of tones that is very striking. Discovered in the 19th century by a French photographer, it often goes by his name: the Sabatier Effect. Never fully understood by photo-chemists it never-the-less has been used to great effect by artists. Man Ray used it effectively and liked to claim he invented it, going so far as to name the prints it produces Ray-o-graphs.
Some of the most striking images made by this technique were made by husband and wife team Clarence Rainwater and Sandy Walker in the 1960’s.
Today mathematical algorithms can effectively reproduce the effect on a computer in a way that easily surpasses the less reliable methods of yesteryear.
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