A process common from 1860 to 1940, printing-out-paper (POP) uses strong levels of ultraviolet sunlight to bring out a visible image, rather than the chemical development required by developing-out paper. These papers were contact printed, a method most often associated with 19th-century photography. Commercially prepared printing-out-papers are still made and printed today, although they are considered a specialty product.
Gelatin silver printing-out-paper print (POP)
7 examples
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Unidentified photographer Untitled c. 1900
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Charles Harry Jones Brussels Sprouts c. 1900
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Unidentified photographer Grand Duke Georgii Mikhailovich Standing on Right, Grand Duchess Olga Alexandrovna Lying in Grass 1903-08
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Ernest J. Bellocq Untitled c. 1912
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Karl Blossfeldt Acanthus mollis (Soft Acanthus, Bear's Breeches. Bracteoles with the Flowers Removed, Enlarged 4 Times) 1898–1928
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Linda Connor Untitled 1973
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Judith Joy Ross Untitled, from Eurana Park, Weatherly, Pennsylvania 1982