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La Phototypogravure A Demi-Teintes sur Zinc

La Phototypogravure A Demi-Teintes sur Zinc, par l’Arteur / Halftone Phototypogravure on Zinc, by the Artist; (Ècran de Levy, 133 lignes – Collodion humide – Procédee émail.) Levy screen, 133 lines – Wet collodion – Enamel process.)

The phototypogravure is a half-tone process on zinc, copper, brass and steel invented by the Maison Goupil which allowed simultaneous printing of photographs and text, thus enabling publication of photographically illustrated books and magazines. A course screen is visible on inspection.