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40 grains acid Advertising alien nitrates ammonia Answer AUTOTYPE bichromated albumen blocks Bolt Court School booklet bottle camera extension cause clean coarse screen colour comets commercial Committee Company Council craft customers darkroom Dittmann dry plates effect etching Federation film FISH GLUE flash exposure Fly-back Action folder funnel Garnier give given glass glue grains per ounce HUNTER-PENROSE Ilford Intaglio interesting iodine ISINGLASS Kingsway Kodak Kodaline letterpress light lines lithographic Lithography London main exposure Manufactured Mason Willy matter metal printing method millimetres mount obtained Photographic Photogravure potassium bichromate pourer practice printers printing trade process engraving produced pyroxylin question relative humidity reproduction round shadow dot screen distance screen negatives Screnetone sensitivity Shading Films shows silver bath silver halides silver nitrate slit solution spots stop watch substratum surface technical school tion tone trouble valuable vignetted wet plate width wire gauze workshop Wratten ZINC