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acid amateur operatic answer AUTOTYPE batches bath beeswax bitumen powder black ink blue boost clamped boards clean coated colour plates Colour Process correct Council density diaphragm DRAGONS BLOOD dry plate duction effect electrotyping Enamel ether exposure Federation filter flat etched gelatine Gilbett give glass glazed roller Glycerine Gold Coast grams gum arabic Half Tone half-tone heat the plate high-light HUNTER-PENROSE ILFORD Illustrations interest Iodine Iron Sulphate issued Kingsway lens letterpress lift light lines London Malvern meeting method negative nitric acid obtained PANCHROMATIC PLATE Patent Photo Engravers PHOTO-LITHO Photographic potassium Potassium Carbonate printer printing PROCESS ENGRAVERS Process House PROCESS LENSES produced Pyramid Lamp qualities Question ratios reader ready reducing removed repro reproduction rolling Rotary Photogravure routing cutters screen shew slight etch solution stripped film stripping collodion success surface three-colour tint tion tone values varnish wash wet collodion process WILLIAM GAMBLE Wratten yellow zinc