An ambrotype was an inexpensive substitute for the far superior daguerreotype. It was introduced by Frederick Archer in 1858 and used for about 30 years. A milky image was produced on a glass plate. To make the image appear positive, the plate was backed with black paper or another dark background. They were not very attractive. Commonly the prints were only part of the plate usually 1/6. Estimated basic value: $80 Go to the Next Entry. Go to the Previous Entry. Return to the Entry List. Return to the Homepage. Search for your Interests. Send us your Comments or Questions.