collodionbased
Collodion-based photography is a historical photographic process that uses collodion as the light-sensitive coating. This method was developed in the mid-19th century and was one of the first practical photographic processes. The term "collodion" refers to a solution of nitrocellulose in ether or alcohol, which was used as a coating on glass plates or metal sheets. The collodion coating was sensitive to light and could be exposed to capture an image.
The process involved several steps. First, the collodion solution was prepared by dissolving nitrocellulose in a
After exposure, the plate was developed using a solution of sodium thiosulfate, which fixed the image by
The collodion-based process was widely used in the mid-19th century, particularly for portraiture and landscape photography.