A photocrom is a colorized image produced from a black and white negative. The image is transferred onto lithographic printing plates and subsequently colorized; it’s essentially a photographic variant of chromolithography, which in turn, was a popular means for the mass printing of color lithographs from the 1870’s to the 1930’s. Hans Jakob Schmid of Switzerland developed the photocrom process in the 1880’s while working for a printing firm. It was all part of what was then the growing art of color photography. Photos courtesy of the Library of Congress.
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