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Academie des Sciences action of light announced Arago artist Athenaeum Bauer Biot bitumen called calotype camera obscura CHAPTER chemical Chevalier Chief Justice claim Claude coated collodion process colors Comptes rendus copy Daguerre Daguerre's process Daguerre's secret daguerreotype dark darkened Diorama discovery ence England engravings experiments exposed exposure fixing France French gallic acid gallo-nitrate of silver Gazette George Eastman House Gernsheim Giroux glass graphic guerre guerre's heliographs Herschel hypo invention inventor iodine iodized Isidore Niepce latent image Lemaitre lens letter light-sensitive London ment mercury microscope mirror Museum negative Niepce Niepce's nitrate of silver objects optical painted Paris patent Pencil of Nature perfect photogenic drawings photographic picture portrait produced published rays Reade Royal Society scientist sensitized paper silver chloride silver halide silver iodide silver plate silver salts solar solution spectrum stone studio Talbot technique tion tures unexposed visible washed Wedgwood wrote