These photographs of Belle Epoque Venice were processed and colored using the Photochrome process. The Library of Congress page on the photochrome process explains it: "Photochrome prints are ink-based images produced through the 'direct photographic transfer of an original negative onto litho and chromographic printing plates'." Hans Jakob Schmid, the inventor of the photochrome, came up with the technique in the 1880s and involves coating a tablet of lithographic limestone with a light-sensitive emulsion, then exposing it to sunlight under negative photos for several hours. includes doing. While Photochrom prints can look an awful lot like color photographs, if you look at them through a magnifying glass and tiny dots containing an ink-based photomechanical image appear. The photomechanical process allowed the mass production of vivid color prints, requiring "a separate asphalt-coated lithographic stone, usually a minimum of six stones and often more than ten stones" (one stone = 6.3 kg) for each color. Is. The photochrome technique has given us, among other fascinating pieces of visual history, these lush images of Venice, the place's author Jan Morris once described as "a city less than an experience". The construction of Venice began after the fall of the Roman Empire in the 5th century when refugees from the mainland fled to the islands in the lagoon. Soon, there were so many of them that they needed more space, so they buried wooden poles deep in the soil beneath the ground.