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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.

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Frederick Walker in Directoire dress
copied by London Stereoscopic & Photographic Company
1870s (1868)
NPG x13281

Mrs Patrick Campbell
by Frederick Hollyer
NPG P229

John Ruskin
by Sarah Angelina Acland
1 August 1893
NPG x5588

Thoby Stephen
by George Charles Beresford
August 1906
NPG x13093

George W. Walker in 'In Dahomey'
by Cavendish Morton
NPG x126392

George Bernard Shaw
by James Craig Annan
NPG P1131

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