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12 inches acid advertising ammonia angle of incidence apprentice ARC LAMPS average printer Barnet black and white Bolt Court coating cold enamel COLLODION colour proofing convention cosine Council cross-line screen cubic centimeters denatured alcohol DESENSITOL direct mail DRAGONS BLOOD Eastman Process Film engraving firm enquiries exposure Federation fumes GILBERT RENE COLOUR give glue gradation grained screens graining bath grams half-tone negatives half-tone printing Holborn hypotenuse ILFORD illumination improve on one's intensity Kappella Karl Klietsch Klimsch lens lenses light source lightened where required line etching line print London Master Printers matter old litho stone ordinary Panchromatic paper Patent photo-engravers photo-mechanical methods Photographic picture place the plate Post free PROCESS ENGRAVERS profit reader ready for etching RENE COLOUR CAMERA rotagravure S. H. Horgan Selling Engraving shellac SIEMENS solution surface tion tone negative tone screen transparent tray United Kingdom varnish wash white space zinc