Woodburytype

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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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

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

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