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Introduction
From 1855 until the end of the 1880s, Mathew Brady (like all photographers) used a four step process to make pictures. First, he prepared a glass plate with solutions of collodion and silver nitrate. While the plate was still wet, he placed it in the camera, exposed it, developed it, and washed it with water, making a negative. When the negative was dry, Brady placed it directly on a sheet of light-sensitive paper, exposed it to the sun. Finally the paper was developed, fixed, and washed, to produce a photograph. This animated demonstration will show you how Mathew Brady made his photographs.
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