The Gallery holds the most extensive collection of portraits in the world. Search over 215,000 works, 150,000 of which are illustrated from the 16th Century to the present day.

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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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