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Agfa Agfacolor albumen Autochrome plate bichromated bichromated gelatin bipack black and white bleached blue light blue sensitivity bromide Calotype coated collodion Colorsnap colour camera colour films colour filters colour image colour photographs colour plate colour printing process colour processes colour screen combined commercial cyan cyanotype Daguerreotype developed Dioptichrome Ducos du Hauron Dufaycolor dye images dye transfer dyed emulsion emulsion layers exposed exposure glass plate green and blue improved inch integral tripack Ives Jos-Pe Journal of Photography Kodachrome film Kromograms Kromskop lantern slide lens light passing Lignose line screen London Lumiere Lumiere brothers magenta magenta and yellow materials method mirror Paget panchromatic paper patented picture plateholder portrait positive primary colours principle prism process introduced produced red filter reflected repeating back rollfilm Sanger-Shepherd screen plate sensitised sheet film silver bromide silver chloride silver image sold spectrum stereoscopic subtractive colours surface three colours tissue transparent reflector