Platinotype
Made by a monochrome printing process, Platinum prints, also called platinotypes, are photographic prints that provide the greatest tonal range of any printing method using chemical development. Dissimilar from the silver print process, platinum lies on the paper surface, while silver lies in a gelatin or albumen emulsion that coats the paper. As a result, since no gelatin emulsion is used, the final platinum image is absolutely matte with a deposit of platinum (and/or palladium, its sister element which is also used in most platinum photographs) absorbed slightly into the paper. Most platinum printing ended around 1914, as the platinum was needed to manufacture high explosives for World War I.
Frederick Walker in Directoire dress
copied by London Stereoscopic & Photographic Company
1870s (1868)
NPG x13281
The Burne-Jones and Morris families
by Frederick Hollyer
1874
NPG x11881
'Pre-Raphaelite phantasme. Adam & Eve!' (Silvia Constance Myers; Leopold Hamilton Myers)
by Eveleen Myers (née Tennant)
circa 1890
NPG Ax68387
Mrs Patrick Campbell
by Frederick Hollyer
1893
NPG P229
John Ruskin
by Sarah Angelina Acland
1 August 1893
NPG x5588
Infanta Eulalia of Spain, Duchess of Galliera
by Alice Hughes
1898
NPG x45049
Thoby Stephen
by George Charles Beresford
August 1906
NPG x13093
George W. Walker in 'In Dahomey'
by Cavendish Morton
1903
NPG x126392
George Bernard Shaw
by James Craig Annan
1910
NPG P1131
Frances Louise Stevenson
by Olive Edis
1917
NPG x16096
The wedding of King George VI and Queen Elizabeth, the Queen Mother
by Bassano Ltd
26 April 1923
NPG x11910
Sir William Hamilton Fyfe
by Olive Edis
circa 1931
NPG x15089