Tintypes are photos with the image on a metal surface, rather than on glass or paper.
The tintype process or ferrotype process evolved from the ambrotype. It was invented by Prof. Hamilton Smith of Ohio in 1856.
Photographic image is taken on a thick metal plate. Black coloured metal (aluminium) plates are coated with collodion (cellulose, ether and alcohol) then sensitised in a silver nitrate bath. The plate is then loaded into a plate camera while wet and a photo is taken. While still wet, the plate is then developed and fixed. Each picture is different even if it has been taken in the same session or minutes apart. Each plate is lightly polished and varnished with Dammar to stop silver oxidisation.
These images represent fine photographic quality with a highlight of silver. They are all originals, shot in a plate camera. Each image is unique.