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Bergsteiger auf dem Titlis in den Urner Alpen, Schweiz, aufgenommen um 1900. COLORIZING PROCESS COMBINING PHOTOGRAPHY AND COLOR LITHOGRAPHY. IT IS USED FROM 1890 TO THE1920 'S TO CREATE A COLOR PRINT FROM A BLACK AND WHITE NEGATIVE, USING BETWEEN FOUR AND FOURTEEN STONES, MADE FROM ROCKLIKE SUBSTANCES, TO COLORIZE THE PRINT WITH SEVERAL DIFFERENT INKS. (KEYSTONE/PHOTOCHROM-GESELLSCHAFT/PHOTOCHROM COLLECTION)