ambrotype
/ˈæmbrəˌtaɪp/
noun
- An early type of photograph made by coating a glass plate with a light-sensitive emulsion, producing a positive image on glass.
- She inherited a collection of ambrotypes showing her great-grandparents in the 1850s.
- The antique shop had a beautiful ambrotype of a Civil War soldier in a brass frame.
- Unlike a daguerreotype, an ambrotype appears as a positive image on glass rather than on a silvered plate.