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60 fluid ozs Acetic acid Adurol advertising Ammonia ammonium Ammonium Chloride answer Board Bolt Court School bromide chessboard Citrate clean Collodion & Iodizer cotton wool Council course craft cross-line screen customers dry plate E. L. Turner effects electro Electrotypes etching depth exhibit Fahr Farringdon firm Fleet Street following solution give glue Glycin grams green scale half tone halftone screen hydroquinone Hypo 15 ozs ILFORD illustrations interesting issue Kodak lightly rub lines Lithography London loses its developing manufacturers MASTER PROCESS ENGRAVERS Meerloo Men's Society metol minutes mounting wood Negative Collodion newspaper obtained operator Panchromatic Plate paper Patent patterns Photo Litho Photo-Lithography photographic photogravure screens Plate Mounts Potassium Potassium bromide Potassium ferricyanide printing Process Blocks produce quarto R.M.R. India red scale reduced result Royle Routers School of Photo-Engraving second colour sensitivity sent shews silver image Silver Nitrate Sodium sulphite tion trade wages Water 60 fluid wood Wratten zinc