Platinum print, Palladium print

A platinum print is made with paper containing light sensitive iron salts and a platinum compound, rather than the conventional silver salts, exposed in daylight in contact with a negative. The process was invented in 1873 by William Willis and made commercially available in 1879. A dramatic rise in the price of platinum after the 1914-18 war led to the decline of the process. They were in part replaced by cheaper palladium prints, the process for which was almost the same, but where a compound of the less expensive metal palladium was used for sensitizing the paper. These processes were valued for their range of subtle tonal effects and their permanence.

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Charles Samuel Keene, by Horace Harral, 1860s - NPG  - © National Portrait Gallery, London

Charles Samuel Keene
by Horace Harral
NPG P861

Leopold Hamilton Myers as

Leopold Hamilton Myers as 'The Compassionate Cherub'
by Eveleen Myers (née Tennant)
NPG Ax36332

Adelaide Passingham, by Eveleen Myers (née Tennant), early 1890s - NPG  - © National Portrait Gallery, London

Adelaide Passingham
by Eveleen Myers (née Tennant)
early 1890s
NPG Ax36315

Mary Chamberlain (née Endicott), by Eveleen Myers (née Tennant), 1890s - NPG  - © National Portrait Gallery, London

Mary Chamberlain (née Endicott)
by Eveleen Myers (née Tennant)
NPG Ax36327

Aubrey Vincent Beardsley, by Frederick Henry Evans, 1894 - NPG  - © National Portrait Gallery, London

Aubrey Vincent Beardsley
by Frederick Henry Evans
NPG P115

'The "Unionist" Whips'
by Sir (John) Benjamin Stone
NPG x128581

Virginia Woolf, by George Charles Beresford, July 1902 - NPG  - © National Portrait Gallery, London

Virginia Woolf
by George Charles Beresford
July 1902
NPG P222

Native American Chief, by Cavendish Morton, 1903 - NPG  - © National Portrait Gallery, London

Native American Chief
by Cavendish Morton
NPG x128850

Noël Coward, by Horst P. Horst, 1933 - NPG  - Horst / Courtesy Staley-Wise Gallery, New York

Noël Coward
by Horst P. Horst
NPG P419

David Hockney, by John Hedgecoe, 1971 - NPG  - © John Hedgecoe / Topfoto

David Hockney
by John Hedgecoe
NPG P160

Ronald David Laing, by Hag, 1978 - NPG  - © Ian Hargreaves / National Portrait Gallery, London

Ronald David Laing
by Hag
NPG P574

Fred Dibnah, by Paul Wolfgang Webster, 1996 - NPG  - © Paul Wolfgang Webster / National Portrait Gallery, London

Fred Dibnah
by Paul Wolfgang Webster
NPG x132241

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