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acid action of light albumen alcohol apparatus appear artist bichromate of potash bitumen bromide Calotype camera camera obscura Carbon Printing chemical chloride coating collodion colour Daguerre Daguerreotype dark room dark slide despatches discovery dissolved employed engraving enlarged etching experiments exposed exposure film focus focussing formed gallic acid gelatine give glass plate grains ground glass gun-cotton heliographic hyposulphite of soda impression instrument invention inventor iodide of silver John Herschel Lantern lens lenses liquid means mercury Messrs metal method microscope minute necessary negative Nicephore Niepce Niepce de Saint-Victor nitrate of silver object obtained operator ordinary ounce paper Paris perfect photographic photographic paper picture placed Poitevin portraits positive potash potassium prepared produced proof Pyrogallic Acid rays render reproduced Saint-Victor sensitised sensitive shadows sheet silver bath solar solution stereoscope substance surface taken tion tube varnish washed wet collodion process