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Potsdam. Schloss Sans-Souci. Voltairezimmer. - EDITORS NOTE : THIS IS A PHOTOCHROM IMAGE. PHOTOCHROM IS A 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)