Daguerrotype made in 1848 of the French chemist and photography pioneer Louis Jacques Daguerre (1789-1851). In the 1820s the French chemist J. N. Niepce produced the first primitive photographs using silver chloride as a photosensitive agent. They worked together but Niepce died in 1833. Daguerre carried on the research and in 1837 was able to devise the first practical method for obtaining photographic images. He used copper plates on which photosensitive silver iodide salts were deposited. After exposure a positive image was produced by exposing the plate to mercury. The remaining silver salts were then removed with a solution of sodium thiosulphate.
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