World’s First Photograph!

Joseph Niepce of France took the world’s first photograph in 1826. He named the photograph “heliograph.” It took 8 hours to take the picture. It is not known however exactly how he took the photo. People are thinking that he used pewter plate coated with bitumen (a petroleum that is sensitive to light). Then he waited 8 hours letting this dry and harden. After that he washed it with white petroleum and lavender oil. It washed away the undissolved bitumen which didn’t see the light. Here is the picture.