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acid Amidol Ammonia applied BLOODIT bright chromium bromide paper carbon cause chromic acid Chromium deposits chromium face clamp clean Collodion & Iodizer colour plates commercial photographer COPPER cylinder dangerous distortion dull deposit etching Fahr FARRINGDON folder four colour fumes Gateshead give grain grams green scales halftone blocks Hand Engraving Hydroquinone illustrations increase ink fountain INTAGLIO Iodizer 27 iron lens letterpress printing line blocks Lithography London machine MASTER PROCESS ENGRAVERS matter MAWSON'S Mercury Compounds metal methods Metol mixed developer mounting wood nega NEWCASTLE-UPON-TYNE Nitric Acid obtained Offset operator original photo-engravers Photogravure poisoning Potassium bromide pressroom printer printing plates prism process blocks produced rays removed reproduction rheostats rollers Royle Routers rubber stereos screen sheet skin solution solvents specimens sulphite sulphur sulphuric acid temperature thick tint tion tone trade transparent yellow vapours ventilating Voice water-colour printing WILLIAM GAMBLE Winchesters Negative Collodion yellow ink zinc