How Collodion Is Now
Collodion continued to be used in photography after it was replaced by gelatin emulsions, as hardened collodion was one of the first film base materials used for gelatin films.
Collodion was in some ways a superior material, producing results that were sharper and apparently less grainy than gelatine emulsions. It was also extremely cheap and relatively fast to use, with short preparation and processing times. Long after it was made obsolete for general photography following the introduction of gelatine dry plates, collodion continued to be used for copy work in commercial practice.