Blanquart-Evrard, Louis D. "Photographie sur papier, moyen d'obtenie l'image a la chambre noire sur papier." *With* "Photographie sur papier". Paris: 1850 & 1851. 1st edition. All weekly issues removed from larger bound volumes of the Comptes Rendus des Seances de l'Academie des Sciences, including:
Blanquart-Evrard, Louis-D. "Photographie sur papier, moyen d'obtenie l'image a la chambre noire sur papier" and offered with: "Photographie sur papier". Both papers in: Comptes Rendus des Seances de l'Academie des Sciences, volume 30, no 21, pp.663-665 and volume 32, no. 15, pp. 555-556.
Both are offered in their scarce original pink printed wrappers.
Helmut Gernsheim (History of Photography) notes that these publications by Blancquart-Evrard "marked the beginning of a new era of photography" by introudcing a "very considerable improvement of Talbot's calotype process". The calotype process offered very contrasty images and were lacking in half-tone sensibilities; "the paper ("wet process") apporach by Blancquart-Evrard, which provided a (paper) surface impregnated with silver nitrate (and therefore much more light-sensitive), was much more able to reveal tone and detail". $1500.
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