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achromatic albumen albumenised paper alcohol ammonia Ammonium aperture bath bichromate blue camera carbon cause CHARLES GRIFFIN chemical chloride coated collodion process colour copper daguerreotype developing solution diaphragm dish dissolved drachm dried dry plates effect eikonogen electric employed emulsion Engineer EXETER STREET experiments exposed exposure ferric oxalate ferrous ferrous chloride film fixing focal length focus focussing formula gallic acid gelatine gelatine plates gold grains ground glass half-tone haloid Illustrations inches iodide iron kind lantern lens lenses magnesium meniscus metal method minutes necessary negative nitric acid object obtained ordinary photographic picture placed platinotype platinum portrait position potassium bichromate potassium bromide potassium ferricyanide practical prepared prints produced purpose pyrogallol quantity rays reduced removed salt screen sensitiser sensitive silver bromide silver nitrate slide sodium thiosulphate soluble spherical aberration stereoscopic substance sufficient sulphate surface taken toning transparent varnish washed wet collodion yellow zinc