The history of the discovery of photography is associated with many names of scientists, inventors and artists who contributed to the development of photography, there were also many scientific discoveries, thanks to which we can save time on paper. But there were also many accidents that helped the pioneers in the field of photography to give the world this wonderful invention of photography.
The first of these accidents was the discovery in 1725 by the German physicist Johann Heinrich Schulze that the property of silver darkens from light, and not from heat, as previously thought. His discovery was accidental, he wanted to get a luminous substance by mixing chalk with nitric acid. There was a little silver in this mixture, and it darkened in the sun. In this case, the part that was not hit by the rays remained light.
For a long time after its publication, this discovery did not find practical application, but we all remember that the first photographic images were made precisely on silver plates. But the image on them was too dim, and it was not possible to develop it. And here the second accident comes to the rescue, one of the inventors of photography, by the name of Daguerre, left a silver plate in a cabinet with chemicals and in the morning saw that the picture on it became clearer.
By exclusion, he came to the conclusion that mercury vapor helped to develop the image. But soon it turned out that the effect lasted no more than a day and the picture began to disappear again. The decision did not come immediately and again by accident. During a dinner of a dozen boiled Daguerre eggs, as it should be, the real inventor did not leave his work and accidentally spilled salt water on one of the silver plates with the image processed by the first "developer", and in the morning noticed a part of the image that was affected by table salt remained bright. This is how the first "fixer" was invented.