ROBIQUET, Henri-Edmond. Manuel théorique et pratique de photographie sur collodion et sur albumine.
Paris, Labé - Masson Sénez, 1859.
12mo (167x108 mm), ix-309 pages and 2 plates (one is a photograph, carbon powder print, tomb of Sultan Mahmoud in Constantinople). binding : Contemporary quarter sheep, gilt flat spine lettered in gilt. Corners chipped. Technical handwritten notes on endleaves and pastedowns. Photo soiled.
Henri-Edmond Robiquet (1822-1860) was a French physicist and a member of the Société de Pharmacie.
He mastered photography and much of the photographic science in his textbook was personally tested in his lab at the school.
Rare first edition, complete with the photograph, using the carbon powder print technics of Garnier and Salmon.
In 1858, Henri Garnier and Alphonse Salmon discovered the photochemical reaction of ferric citrate, altering its hygroscopic and solubility properties. This led to the invention of their "dusting-on" process – procédé au charbon – using a positive rather than a negative to make the exposure. Pine soot, pigment, or metal salt particles were affixed to the tacky areas of unexposed emulsion, using a tampon in conjunction with the hot breath of the photographer. The particles were then easily washed out of the exposed areas of emulsion, leaving behind the grained image. A year later, Garnier and Salmon abandoned iron salts to pursue emulsions of ammonium dichromate and sugar. The plate in Robiquet's book is one of few, or maybe the sole, published example from their workshop of their carbon powder method.
Price : 750 €