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     EduGorilla 
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    1. The invention of photography was a delayed fusion of two scientific ideas that had long been in isolated existence.
    2. Scientific community had long known that the ingredients of photography were available, but they could not proceed further because bleaching needed clear distinction between heat, air and light.
    3. Camera Obscura had been invented as early as in 1519 but the process of bleaching had not been perfected, as a result of which the invention of photography was much delayed.
    4. Photography is a mélange of two scientific processes -  the use of dark room and the knowledge that some colours do not get bleached in the sun. Such a fusion that was not possible till 1830s.
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