Invented in the 1860's the process was patented in 1864 by Mr Walter B. Woodbury. The process was used only for a few decades, and is now an obsolete photomechanical process originally developed to create true continuous-tone images. A continuous-tone process that is more well-known and currently used by printmakers and graphic artists is collotype. Both are based on the same idea - creating a gelatin relief by exposing a transparent original in contact with a light-sensitive gelatin layer.

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'Group taken at Hughenden Manor'
by Henry William Taunt & Co, published by A.W. Cowan
1874, published 1881
NPG Ax27804

Matthew Webb
by Horatio Nelson King
NPG x19929

Amy Roselle (Mrs Arthur Dacre)
by Unknown photographer
circa 1876
NPG Ax7627

Kuo Sung-tao
by Lock & Whitfield
1880 or before
NPG x132257

Leonora Braham as Patience in 'Patience'
by London Stereoscopic & Photographic Company, published by Charles Dickens & Evans
published 1 March 1882
NPG x6415

William Ewart Gladstone
by Elliott & Fry, published by Bickers & Son
published 1886
NPG Ax27805

Sir Henry Irving
by Lock & Whitfield, published by Sampson Low, Marston, Searle and Rivington
published 1883
NPG Ax17711

Lord Randolph Churchill
by Unknown photographer
circa 1885
NPG x6116

Maude Millett (Mrs Tennant)
by Alfred Ellis
published September 1893
NPG x12527

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