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amateur Ammonia Answer Arc Lamp art paper Baker Machine Baker's Etcher BARNET bichromate black and white blacken Blotters booklet BRITISH ISINGLASS calendar camera extension Carbonate Citric Acid Clerkenwell coated colloid colour copper Craske crossline screen dots Dragon's Blood dry plate effect electric etching machine electrolytic Engraving Glue F. E. B. Thomas Federation ferric chloride films give Grain Screen graphy Hendon highlight HUNTER-PENROSE Hydrochloric Acid illustrations immersion improve the result inch Industrial Spirit interesting Iodide iron perchloride Iron Sulphate issue KINGSWAY Kodak Kodaline layer lens light London Manchester manufacture Mark Smith machine Messrs method millimetres Nickeloid nodal point obtained ordinary overlay Photo Engravers Photographic photogravure printer Process Engraving produced Question CXX reproduction retouching Revolvax machine Rocking bath roller scientific screen negative screen opening Screen separation shadow Silver Nitrate Sodium Carbonate solution specially stop aperture surface temperature tion usual Wealdstone wet collodion Wratten zinc