Photography
In photography, photographic films have silver bromide crystal coating. In the presence of light, silver bromide crystals form into silver atoms. Silver bromide crystal wich have not been exposed to light are removed by dissolving in a solution called "fixer".
The film is now called a "Negative", the opaque parts have been exposed to lights while the transparent parts are not exposed to light. When the film is exposed to light, the photograph will be formed.
This is an endothermic reaction where energy is absorbed(light energy).
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