Photochrom prints, also called Aäc, are ink-based images produced through "the direct photographic transfer of an original negative onto litho and chromographic printing plates." Hans Jakob Schmid (1856-1924), who worked for the Swiss firm Orell Füssli, invented the technique in the 1880s. Füssli published the prints through a company with the imprint Photochrom Zürich, later Photoglob Zürich. Other companies that licensed the process starting in the mid 1890s included the Detroit Photographic Company (later Detroit Publishing Company) in the United States and the Photochrom Company in London, England. This photochrom process is not the same as the French color process called "photochrome."

A characteristic of the photochrom print is a gold-lettered caption along one edge and an inventory number. The initials "P.Z." indicate prints produced at the Photochrom and Photoglob Zürich 

look out for other Photochroms too

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