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advertising Ammonium iodide apprentices arc lamps Bakelite blocks blue Cadmium bromide Cadmium iodide Calcium chloride Carbons cent solution cerium CHEMICALS collodion film Collodion iodized Continuous Tone Negative copper corrected curved plates detail and gradation developer diaphragms distilled 20 ozs dry plate Eastman effective electro employer exposure Federation of Master fixing focal distance give green HOC RAPHIC Holborn increase industrial methylated spirit Industrial spirit inks interlay KINGSWAY Kodapan lated spirit letter heading LITHOGRAPHY London machines manufactured masking process Master Printers ment methy METOL moisture mount obtained opacity original half-tone Panchromatic paper peacock-blue Photo PHOTOGRAVURE portrait photographer potassium cyanide printing pressure printing solution produced purple pyroxylin question RAPHIC PURPOSES Re-developer re-touching reproduction reversed from left screen negative sensitivity SHEETS silver bromide silver deposits silver image silver iodide silver nitrate suitable surface three colours tion trade violet visitor Water distilled 20 wet collodion process wood yellow