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action of light alcohol ammonia appears applied baryta beautiful bichromate of potash blackened bromide Calotype camera obscura Chemist chloride of silver colour Compt copper copy Cornwall Cornwall Polytechnic Daguerre Daguerre's Daguerreotype dark darkening Devonport dissolved dried effect engraving etching experiments exposed exposure fixing fluid formed glass grains Herschel Letters Hunt's Treatise hydriodic salts hyposulphite of soda Ibid images influence of light iodide iodide of silver iodine L. J. M. Daguerre lens London mercury metal method muriate of soda muriatic acid Niepce nitrate of silver nitric acid object operation oxide papers prepared Penzance perfect Phil Philosophical Photogenic Drawing photographic paper photographic processes picture plate procured produced published Rend rendered Rept Robert Hunt Royal Society salts of silver sensitive paper shadows sheet Sir John Herschel sulphuretted sunshine surface tablet tint tion vapour varnish violet rays W. H. F. Talbot washed yellow