This country has managed to preserve its nature.
These postcards depicting mountains, fjords, glaciers and cities in Norway in the late 19th century has produced firm Detroit Publishing Company. For their production using a process photochrome (Photochrom), invented in the 1880s a Swiss employee of the printing company.
This was a painstaking and time-consuming technique for coloring black and white images. In the process used lithographic limestone stones, which were covered with a light sensitive emulsion and exposed to sunlight through the negative. The emulsion is solidified in proportion to the tones of the negative, forming on the lithographic stone fixed image.
Each shade is made of a separate printed form. Therefore, in the production of a single card could use more than a dozen of the printing stones.
The result was a color image, the quality is much superior to the picture painted by hand. The realism of the rendering for those times seemed truly impressive.
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