Paris: Chez Lerebours et Secretan, . First edition. 8vo., 8,  pp. Original printed wrappers. Light toning at the edges, with a light chemical stain on the blank margin of 2 leaves. A very good copy housed in a paper over boards pamphlet case with printed paper labels. Item #52077
Little seems to be known of the life of Ferdinand Colas, other than he was born in France in 1820, but lived in England from at least 1841 until his death in 1876. From 1844 to 1849, he's listed as a pasteboard box maker on Fleet Street, and again in 1861. From 1851 to 1859, he's listed as a photographer at 105 Cheapside, London, the earlier years in partnership with F.A. Mouqué. He was a student of N.P. Lerebours, a prominent French manufacturer of lenses, cameras, optical instruments, and photographic supplies, as well as an accomplished daguerreotypist. In this short manual, Colas discusses the differences between the then established French method, and the "so called, American method." The major differences are in the polishing of the plate and use of compounds of bromine, chlorine, and iodine with lime as an accelerant.
WorldCat locates a single copy of this first edition at the Bibliotheque Nationale de France. There is a copy dated 1849 at the Bibliotheque de Geneve, and five copies of an 1850 second edition. Roosens and Salue No. 6511. Bellier de la Chavignerie, Manuel Bibliographie du Photographe Francais, 1863, No. 44.