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acidified advertising alcohol bath solution Battle Creek bichromated boiling booklet bottle Bride St Brigdens Bromide Paper Camera carbon cause Clamped Board collodion collotype COLUMN SAW copied by reflection copper cyanide Defective Fish Glue developer dissolve effect ENDS OF BELTING Engraving house etching exposure FARRINGDON AVENUE fast non-colour-sensitive fasteners gelatine give glass gradation of tone GRAINED SCREEN Grease Hand Engraving HUNTER-PENROSE Hydrokinone ILFORD Illustration impurities intensifying iodine JOHN ROYLE Kingsway Kodak light lines per inch Lithography London manufacture MASTER PROCESS ENGRAVERS method methylated spirit Mintite negative Night Photography operators optical patent plate penumbral shadow phosphorescent plate Photo-Engraving piece pinholes price maintenance printing surface Process Block pyroxyline re-production Rheinlander ROLLER COVERINGS Rotary Photogravure ROYLE & SONS Royle Cutter selling sensitising bath silver bath silver iodide silver nitrate solution Soda spots tight plug tion tive to-day tone screen trouble WILLIAM GAMBLE Wood and Process