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1842 by Talbot achieved Arago artist's pencil artistic Beaumont Newhall Biot Blanquart-Evrard calotype camera obscura chemical collodion process colours contact print copies D. B. Thomas Daguerre Daguerreotype daidw dated David Brewster developed discovered discoveries English inventor engraving enthusiasm Eugen Ostroff famous fixing French gallic acid gelatin Gernsheim guineas Henneman Henry Fox Talbot Herschel images on paper infrared photography interested invention January Lacock Abbey cloister license light London possesses medium ment method mixed plates Museum in London negative print Negative-Positive Niepce Niepce's experi nuoloa objects patent Pencil of Nature persons have imagined Photogenic drawing photoglyptic gravure photographic images Photographic Process Photographic Science Pictures in Scotland portraits positive print possible potassium publication published remarkable reproduction of etchings resin dust reveal Royal Society salt Science Museum scientific scientists sensitive paper silver chloride silver nitrate sodium thiosulphate solar microscope solution succeeded Sun Pictures Talbot wrote tion William Henry Fox