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It was a dark room with a single small hole in the side which let light through
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He discovered that exposing the certain silver compound to light, it will leave marks wherever the light touched. The problem was that it was only projected for a little while
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People discovered that they could make the picture stay there after exposure
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He tried to create a dry plate which will expose negativesto be stored and developed later in a more convinient place
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After starting a business, he discovered plastic room fill which will be stored in a small box which were sold by the tag "You push the botton, we do the rest"
