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The wet plate (or colldion) process was in use at the time. This involved coating a glass plate with a solution that when slightly gelled, was immersed in silver nitrate. While still wet, the plate had to be exposed whithin 15 minutes, then developed before it dried. The process was cheaper than the daguerrotype (more expensive chemicals on a copper plate, long exposure times and a single positive image), and produced a glass negative which could produce many prints with great detail. Some of the cons of this process was that the coating was only sensitive to blue light, and the silver nitrate could get contaminated (the plate would fail to produce an image) and clog up cameras and plate holders. It also provided little time to produce the exposure and required a portable darkroom to coat, expose and develop the plates.

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11y ago

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