An Ambrotype is an early photographic process that produces a positive image on a glass plate. This technique was popular in the mid-19th century and involved coating a glass plate with a light-sensitive emulsion. After exposure in a camera, the plate was developed and fixed, resulting in a unique image that appears as a positive when viewed against a dark background. Ambrotypes are often associated with the Daguerreotype, another early photographic method, but they are distinguished by their use of glass instead of metal. The process allowed for detailed portraits and was widely used by traveling photographers, making it a significant part of the history of photography.