He predominantly produced albumen silver prints from wet collodion glass-plate negatives. KCN is used as a photographic fixer in the wet plate collodion process. The collodion process is an early photographic process. It was composed of 10% camphor, 45% nitroglycerine and 45% collodion (nitrocellulose). The silver and iodine ions in solution reacted, forming silver iodide on the collodion film. Early plates used the wet collodion process. Known causes of collodion baby include ichthyosis vulgaris and trichothiodystrophy. His formulation was composed of 10% camphor and equal parts nitroglycerine and collodion. Such collodion glass positives had been invented by Frederick Scott Archer in 1851. The ambrotype was based on the wet plate collodion process invented by Frederick Scott Archer. In 1851 Frederick Scott Archer invented the collodion process. Matte collodion was used in the same period. The wet collodion process had a major disadvantage. Despite its disadvantages, wet plate collodion became enormously popular. The ambrotype was the first use of the wet-plate collodion process as a positive image.