Posted 5 years ago
Original Photogravure Goupil
Charles C. Curran
“WINTER MORNING IN THE BARNYARD”
Frame Size: 22 1/2" x 18 3/8"
Invented by Rousselon in 1872, who described his process as follow:
“The value of our process of photogravure consists in the possibility of obtaining, by means of light, an etched copper-plate exactly like the ordinary copper-plate, and giving all the gradations of tone and half-tone, as drawn by nature in the ordinary photograph. Our process is founded on the discovery of a chemical substance which crystallizes under the influence of light, the crystals becoming larger the longer they are exposed to it. After exposure it only remains to make a deposit of copper, by means of the electric battery, on the crystalline surface, and thus a plate is obtained yielding proofs in which every detail and gradation of tone is faithfully reproduced.”