Glass positive

From 1850 onwards flat sheets of glass were used as supports for light-sensitive materials used in photography. They were used for positives, like the ambrotype, or more frequently, for photographic negatives. Albumen, collodion, and gelatin carrying light-sensitive silver salts have all been successfully used for coating glass plates to use in the camera. The term 'glass plate' most often applies to the collodion process.

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Rupert Brooke, by Sherrill Schell, April 1913 - NPG  - © reserved; collection National Portrait Gallery, London

Rupert Brooke
by Sherrill Schell
April 1913
NPG P101(e)

Rupert Brooke, by Sherrill Schell, April 1913 - NPG  - © reserved; collection National Portrait Gallery, London

Rupert Brooke
by Sherrill Schell
April 1913
NPG P101(b)

Rupert Brooke, by Sherrill Schell, April 1913 - NPG  - © reserved; collection National Portrait Gallery, London

Rupert Brooke
by Sherrill Schell
April 1913
NPG P101(f)

Rupert Brooke, by Sherrill Schell, April 1913 - NPG  - © reserved; collection National Portrait Gallery, London

Rupert Brooke
by Sherrill Schell
April 1913
NPG P101(g)

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