
upright=1.6|thumb|Many ambrotypes were made by unknown photographers, such as this American example of a Union soldier (Sgt. Samuel Smith, 119th United States Colored Troops|USCT) with his family, –65. Because of their fragility, ambrotypes were usually kept in folding cases like those used for [[daguerreotypes. This example is framed for display.]]
upright=1.6|thumb|Many ambrotypes were made by unknown photographers, such as this American example of a Union soldier (Sgt. Samuel Smith, 119th United States Colored Troops|USCT) with his family, –65. Because of their fragility, ambrotypes were usually kept in folding cases like those used for [[daguerreotypes. This example is framed for display.]]
The ambrotype, also known as a collodion positive in the United Kingdom, is a positive photograph on glass made by a variant of the wet plate collodion process. As a cheaper alternative to the French daguerreotype, ambrotypes came to replace them. Like a print on paper, it is viewed by reflected light. Like the daguerreotype or the prints produced by a Polaroid camera, each is a unique original that could only be duplicated by using a camera to copy it.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).