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100 times enlarged action advertising ammonia ammonium salts Answer to Question AUTOTYPE Award Blood sticking bottom camera ccs.—add Chepstow CLAMPED BOARDS CLERKENWELL collodion Colour Etchers COPPER HALF-TONES critical angle distilled water Dragons Blood effect enamel coating FARRINGDON ROAD FEDERATION OF MASTER film fine-etching flask glue gravure Greenhill grms Half Tone half-tone operator HENDON hypotenuse Ilford Panchromatic Plates illumination ink and bitumen Intaglio iron perchloride JOHNSON & SONS Kingsway lens line etching London machine etching Manufactured MASTER PROCESS ENGRAVERS Men's Society Messrs metal method of etching methylated spirit mordant need for re-silvering nitric acid obvious screen pattern ounces paper Patent Photo-Engraver point of undercutting possible post free powder prism produce Pyramid Lamp Question 17 quicker removed Rotary Photogravure screen finder scum Sedbury silver bath silver iodide silver nitrate stoneware trough tinge is obtained tion to-day tone values vignetted W. G. Briggs Wratten Daylight Filter zinc