Ferrotype

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Ferrotypes (also known {in the USA} as Tintypes) are photographs made onto black-enamelled tin plates by the wet-collodion process. The black background made the transparent areas of the negative image appear black, and the dark, silvered areas were whitened using mercuric bichloride, and so appear light - in the same way as glass Ambrotypes.

French photographer Adolphe Martin was the first to use this process. The process was used in the US until the early 1940s.