The first successful experimental photographic attempt was heliogravure, discovered by Joseph Niépce around 1820. This French chemist used a camera obscura where he exposed for eight hours a surface of paper, glass and metals such as tin, copper and pewter.
The result was a more or less clear impression of what was observed. But since the fixation issue had not been resolved, the images thus obtained were slowly being lost. In 1825 he obtained the first permanent image using a Judean bitumen mixture as a photosensitive mixture.
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