YoCo Dates Photos with the Ottawa Jewish Archives, Part 5: Ambrotypes
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.
Ambrotypes, in use from 1854-1865, were created by a variant of the collodion process. It was a positive image created on glass. They were replaced by the similar tin types, which were positive images created on thin pieces of black-lacquered iron. Tin types were in use until the 1920s.