Ambrotype

A photographic image on glass where a positive print was produced without the need to print from a negative. An underexposed and then developed collodion negative on glass, when backed with an opaque coating such as black lacquer, appeared as a positive image. The process was developed in 1852 and promoted by commercial studios as a cheap alternative to daguerreotypes and was used mostly for portraiture.

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Derwent Coleridge; Mary Coleridge (née Pridham), by Unknown photographer, 1856 - NPG  - © National Portrait Gallery, London

Derwent Coleridge; Mary Coleridge (née Pridham)
by Unknown photographer
1856
NPG P322

Barbara Leigh Smith Bodichon, by

Barbara Leigh Smith Bodichon
by 'Holmes of New York'
1857 or 1858
NPG P137

Sir Joseph Nias, by Unknown photographer,  - NPG  - © National Portrait Gallery, London

Sir Joseph Nias
by Unknown photographer
NPG P2

Luke Howard; John Eliot Howard (right), by Unknown photographer, circa 1855-1860 - NPG  - © National Portrait Gallery, London

Luke Howard; John Eliot Howard (right)
by Unknown photographer
circa 1855-1860
NPG P784

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