LAFON de CARMARSAC Pierre Michel (1821-1905). Photographic enamel on copper plate. Signature on the back: Lafon de Carmasac process, Hélios rue Cadet (gold medal in 1867 at the Universal Exhibition) . Plate: 11.5 x 15.2 cm. Embossed metal frame : 27.3 x 29.2 cm. See the description of the process in the History of Photography by Raymond Lécuyer, page 126.
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