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acid albumen amount applied artist bichromate bichromated gelatine bitumen block blue camera cavities character coating colloidal collotype colour consequence considerable continuous tone copper correct density drawing dry plate effect employed emulsion enamelline engraver etcher etching example exposed exposure ferric chloride film filters fish glue focussing gelatine gelatose give glass gradation grain gravure green grey half-tone hues increase insoluble intaglio lens lithographic machine material matrix means medium metal method metol mordant necessary ordinary original panchromatic paper particles Penrose Annual photo-engraver photo-lithography photo-mechanical photogravure picture pigment positive practice pressure principle printer produced purpose quantity relief rendering resist result roller ruled screen screen negative sensitive plate sensitive surface sheet silver silver bromide silver nitrate simple soluble solution stone student suitable surface tension three-colour tint tion transfer transparent type-high varnish wet collodion whilst yellow zinc