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acid advertising ammonia amount Answer artistic Award bargain hunter Battle Creek bitumen blackener Blotters booklet bubbles called camera cement Chemicals chromium clean Collodions Collotype colour printing Company competitive prices competitors copper Council cross-line screen cut price cylinder depth diaphragm difficulty dissolve dots dry plate effect emulsion exposure fixation fixing bath folder gelatine give grain gravure grey Half Tone Screens half-tone Hunter-Penrose Ltd hypo solution ILFORD illustrations insufficient washing Intaglio intensified interested in competitive interested in quality irregular grain screen issue JOHN ROYLE Kingsway lamp lens lenses light line screen London machine gravure manufactured mechanical metallic silver method Metzograph middle tones MOUNTING WOOD obtained paper perfect Photo Engraving Photographic picture piece polishing possible customers PRINTERS printing frame produced removed result roulette ROUTER rubbing School screen distance sent sheet shew silver bromide silver iodide SILVER NITRATE specimens steel three-colour tion tive various WILLIAM GAMBLE ZINC