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ambrotype

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n. ~ A positive photograph on glass made using the wet-collodion process, often hand-tinted and mounted in a hinged case.

Notes: 

An ambrotype is an underexposed, underdeveloped, wet-collodion negative on glass that, when viewed with a dark background, appears as a positive image. The dark background is commonly a black varnish applied to the glass base but is sometimes a separate material behind the glass or the glass base itself may be dark. The same process using a black-varnished metal plate is known as a tintype.

Ambrotypes were patented in 1854 by James Ambrose Cutting and were common through the 1870s. They largely supplanted daguerreotypes.