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absorbed actinic value Alfriston ammonia apparatus arc lamps Autotype bitumen blue brown burnt-in camera carbon tissue cent solution chemical chromic acid co-operation coarse screen copper plates Council Daguerreotype direct on metal duced emulsion Engraving House exposed exposure eyes FARRINGDON ferric chloride filter FISH GLUE gelatine give glossy enamel glue solution guarantee half-tone hardening HUNTER-PENROSE HUNTERITE ETCHING MACHINE Hunterite steel illustrations immersing interest issued Kingsway Kodak Kodaline light produces white London luminosity Manufactured Mark Smith Etching mercury Messrs method methylated spirit monochrome negative nitric acid obtained Old Steine Penrose's Annual Photo photo-engraver PHOTO-MECHANICAL PAPERS photographic image photogravure pigments produces black poster printing plates Process Photogram Question CXI Questions and Answers R+G+B reader repro resist Saint Peter Scroll sensitive SIDE PLATES Smith Etching Machine Smith machine specimens thin three primaries tion tone varnish wet collodion white light WILLIAM GAMBLE William Templeton yellow zinc zinc plate