Its purpose was to show on paper an image which could be traced by hand to give accurate drawings of natural scenes. In 1802, two men, Wedgwood and Humphry, took an important step forward.
The recorded by contact printing, on paper coated with silver nitrate or silver chloride, silhouettes and images of paintings made upon glass. But they could not make these prints permanent.
From then on, a whole series of improvements and developments came one after the other. The popular Kodak box camera was placed on the market in 1888, and the photography as we know it was on its way.
Most photographic processes depend on the fact that the chemical silver nitrate reacts to light by turning black. And this was discovered way back in the seventeenth century by alchemists who were trying to find a way to turn common metals to gold.
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