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acid-resisting advertising alcohol ammonia Ben Day blue light cent Chemical CLERKENWELL Collodion & Iodizer Collotype created creative business creative selling developed DRAGONS BLOOD dry plate effect employees emulsion etchers etching machines experience exposure fact Farringdon Federation foreign competition give glue image gradation of tone green half-tone Hauron Hendon Howard illustrations industry INTAGLIO interesting Kaulen process Kingsway Kodak letterpress light action London Manufactured ment metal method of three-colour month Nitric Acid number of pages obtained old customers opacity original overlay Panchromatic photographic records plate speeds printer printing colours Process Block Process Plate production question red light reproduced screen Section for designs Shadowgraph shewing silver deposit Silver Nitrate solution spectrum speed number standard supply tariff three-colour photography tint tion trade type matter varieties of dry violet volume of business washed WILLIAM GAMBLE Winchesters Negative Collodion Wratten yellow zinc etching zinc plate