YoCo Dates Photos with the Ottawa Jewish Archives, Part 4: Collodion
The Bytown Museum Youth Council recently hosted guest speaker, Saara Mortensen, archivist from the Ottawa Jewish Archives to learn about the history of photography and techniques for determining the age of a photo.
The collodion process was developed in 1851 by Frederick Scott Archer and Gustave Le Gray. Collodion, a mixture of nitrocellulose, alcohol, and ether, required the photograph to be coated,exposed and developed within fifteen minutes. This created a separate negative and positive image.