Photochrom is a process for producing colorized images from black-and-white photographic negatives via the direct photographic transfer of a negative onto lithographic printing plates.
The process was invented in the 1880s by Hans Jakob Schmid (1856-1924), an employee of the Swiss company Orell Gessner Füssli. Füssli founded the stock company Photochrom Zürich (later Photoglob Zürich) as the business vehicle for the commercial exploitation of the process and both Füssli and Photoglob continue to exist today.
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