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 is a photographic variant of chromolithography (color lithography). The process was invented in the 1880s by Hans Jakob Schmid (1856–1924), an employee of the Swiss...
Photochrom postcards from 1900s
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 is a photographic variant of chromolithography (color lithography). The process was invented in the 1880s by Hans Jakob Schmid (1856–1924), an employee of the Swiss...