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Developing & Printing The Photograph 
In the darkroom, the exposed plate was developed by placing it in a series of chemical solutions. Developer (pyrogallic acid) was followed by fixer (usually potassium cyanide or sodium thiosulfate) to removed all unexposed silver, and a final bath of water to clean the plate. Once dry, the negative was placed again a piece of light-sensitive paper, and exposed to the sun. The length of exposure could be as short as a few minuets, or as long as an hour, depending on the sunlight. The exposed paper was then developed, washed and dried, and the photograph was complete.
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