Daguerrotype A. The inventor was Louis Jacques Mande Daguerre in 1839 B. The process: The process of making a daguerreotype starts with a silver-plated copper plate. That plate is first buffed and polished until it looks like a mirror. Then the plate is sensitized to light over iodine and bromine in specialized, light-proof boxes. The plate, now yellow-rose in appearance, is then transferred via a light-proof holder into a camera, where it is exposed.Once the plate is exposed, it’s developed or “brought out” over hot mercury, fixed by immersion in a solution of sodium thiosulfate and then washed with distilled water. The final step is to tone or gild the plate using gold chloride Cyanotype A. The inventor was John Herschel in 1842. B. The chemicals used in a cyanotype are ferric ammonium citrate, potassium ferricyanide, hydrogen peroxide, and H2O. C. Steps of creating a cyanotype.
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Clare HoffmanArchives
May 2017
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