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Annual Meeting Answer bichromate Calendar camera caustic developer caustic potash Chemicals chromic chromic acid chromium clamps clean clear coated colour commercial photographer continuous tone contrast copper density dissolved dot formation Electrolytic etched emulsion enamel exposed exposure Farringdon Federation ferric chloride film Fish Glue formula gelatine give grain GRIMSBY half-tone screen hot water Hotel Victoria House HUNTER-PENROSE hydrochloric acid interest J. H. Whitfield join Kingsway Knighton Kodaline light sensitive London makers membership ment mercury metal method metol nega newspaper Nitric acid Offset Lithography paper penumbra perchloride of iron photo-engraver PHOTOGRAVURE placed possible potassium bichromate potassium bromide printing industry PROCESS MONTHLY Process Photogram Process plates produced questions reproduced rotary ROUTERS sal-ammoniac screen distance sensitive plate sent forward shadow dots shellac and dragon's silver solution Speaights speed suitable tive tone gradation Trist two-colour wet plate WILLIAM GAMBLE zinc