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In 1614, Angelo Sala demonstrated that "powdered silver nitrate is blackened by the sun",[9] as was paper that was wrapped around it.
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Around 1717 Johann Heinrich Schulze, a German professor of anatomy and physics, set down a bottle containing silver nitrate and chalk by the window and unintentionally in the path of incoming light from the sun. Created a line in the paper this came from the shade of the hanger on his window
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In 1839 the first pin hole camera was invented by using light sensitive paper
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Two inventor continued to create different ways to make pinhole cameras available and making them last. Louis Daguerre went on to create the daguerreotype which required only minutes of exposure in the camera, and produced clear, finely detailed results. where as The metal-based daguerreotype process soon had some competition from the paper-based calotype negative and salt print processes invented by William Henry Fox Talbot.
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