History
At the start of photography a wide range of developing agents were experimented with including human urine. Very soon more successful agents came into use such as salts of iron such as iron oxalate, iron sulfate and iron lactate as in the ferrotype, wet plate and ambrotype processes.
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“I believe that history might be, and ought to be, taught in a new fashion so as to make the meaning of it as a process of evolution intelligible to the young.”
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