Photography:
The photographic plate is covered with a colloidal gelatinised solution of AgBr. When, the exposure, AgBr is decreased to the metallic silver.
This is described in the following equation:
The exposed film is developed. The developer employed is an alkaline solution of hydroquinone or quinol that reduces a number of the exposed AgBr to black silver.
Equation:
The film is finally fixed by dipping in a solution of sodium thiosulphate or hypo that eliminates not changed AgBr like complex ion.
Later than taking the print of photograph at last it is toned by dipping in a dilute solution of gold chloride to impart a beautiful golden colour or it is dipped in potassium chloro platinate K2PtCl6 solution to obtain a shining grey tinge.
Equation for this is as shown below:
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