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Following Niepce’s unsuccessful attempt, Daguerre developed a method that enabled him to fix a camera obscura’s image in 1839. Fully aware of the reaction that silver iodide makes when exposed to light, he succeeded in fixing the image on copper or silver plates coated with silver iodide. The sensitized silver iodide was then developed by mercury vapor and the silver molecule image could be fixed with sodium thiosulfate. Daguerre named this method the “Dauguerreotype” and with that established the realm of photography.
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