Unique colored cards.
Colour postcards sun-scorched streets with Moorish architecture was created using the process photogram, which allowed realistic to paint a black and white image at the end of the 19th century.
This laborious and time-consuming method of chromolithography was invented in the 1880s a Swiss employee of the printing company. 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 is a colored image with realistic colour reproduction. In these images etched palaces and bustling markets of Tunisia in the first decades of the establishment of the French protectorate.
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