Calotype

A process for making paper negatives discovered in 1840 by W.H. Fox Talbot. As the first process that involved both a negative and a positive, it was the forerunner of today's photographic processes. High quality writing paper was sensitized with potassium iodide and silver nitrate solutions and exposed in the camera. The paper negative was processed, then printed onto salted paper. A feature of prints made from calotype negatives is the lack of clarity in the details and a mottling of tones, caused by the fibres in the paper showing through.

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Sir David Brewster, by David Octavius Hill, and  Robert Adamson, 1843 - NPG  - © National Portrait Gallery, London

Sir David Brewster
by David Octavius Hill, and Robert Adamson
1843
NPG P6(10)

George Combe, by David Octavius Hill, and  Robert Adamson, 1843 - NPG  - © National Portrait Gallery, London

George Combe
by David Octavius Hill, and Robert Adamson
1843
NPG P6(87)

Fisher Lassie and Child, by David Octavius Hill, and  Robert Adamson, 1843-1848 - NPG  - © National Portrait Gallery, London

Fisher Lassie and Child
by David Octavius Hill, and Robert Adamson
1843-1848
NPG P6(201)

John Henning, by David Octavius Hill, and  Robert Adamson, 1843-1848 - NPG  - © National Portrait Gallery, London

John Henning
by David Octavius Hill, and Robert Adamson
1843-1848
NPG x18788

David Octavius Hill, by David Octavius Hill, and  Robert Adamson, circa 1843 - NPG  - © National Portrait Gallery, London

David Octavius Hill
by David Octavius Hill, and Robert Adamson
circa 1843
NPG P6(1)

Anna Brownell Jameson (née Murphy), by David Octavius Hill, and  Robert Adamson, 1843-1848 - NPG  - © National Portrait Gallery, London

Anna Brownell Jameson (née Murphy)
by David Octavius Hill, and Robert Adamson
1843-1848
NPG P6(112)

Sandy Linton, his boat and his bairns, by David Octavius Hill, and  Robert Adamson, 1843-1848 - NPG  - © National Portrait Gallery, London

Sandy Linton, his boat and his bairns
by David Octavius Hill, and Robert Adamson
1843-1848
NPG P6(199)

Elizabeth Logan, by David Octavius Hill, and  Robert Adamson, 1843-1848 - NPG  - © National Portrait Gallery, London

Elizabeth Logan
by David Octavius Hill, and Robert Adamson
1843-1848
NPG P6(172)

Mr Moir; John Gibson, by David Octavius Hill, and  Robert Adamson, 1843-1848 - NPG  - © National Portrait Gallery, London

Mr Moir; John Gibson
by David Octavius Hill, and Robert Adamson
1843-1848
NPG P6(154)

Robert Stephen Rintoul, by David Octavius Hill, and  Robert Adamson, 1843-1848 - NPG  - © National Portrait Gallery, London

Robert Stephen Rintoul
by David Octavius Hill, and Robert Adamson
1843-1848
NPG P6(79)

Anne Rigby (née Palgrave); Elizabeth, Lady Eastlake (née Rigby), by David Octavius Hill, and  Robert Adamson, 1843-1848 - NPG  - © National Portrait Gallery, London

Anne Rigby (née Palgrave); Elizabeth, Lady Eastlake (née Rigby)
by David Octavius Hill, and Robert Adamson
1843-1848
NPG P6(134)

Elizabeth (née Rigby), Lady Eastlake, by David Octavius Hill, and  Robert Adamson, 1843-1848 - NPG  - © National Portrait Gallery, London

Elizabeth (née Rigby), Lady Eastlake
by David Octavius Hill, and Robert Adamson
1843-1848
NPG P6(124)

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