A photomechanical produced image made from a photographic image, with similarities to the lithographic printing process. The process evolved gradually from the work of A.L. Poitevin in the 1850s and is still in occasional use. It produces prints which can be of very high quality with finely detailed images and the appearance of having continuous tone. A finished collotype, especially if varnished, is often difficult to distinguish from a true photograph.

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Queen Elizabeth I as patroness of Geography and Astronomy
by Emery Walker Ltd, after Remigius Hogenberg
early 20th century (1579)
NPG D31837

Sir John Everett Millais, 1st Bt
published by The British and Foreign Artists' Association, after Charles Albert Waltner, after Sir John Everett Millais, 1st Bt
1 January 1881 (1880)
NPG D33173

Sir Walter Edgeworth-Johnstone
by Ernest Clarence Elliott, for Elliott & Fry
published 1904
NPG Ax39966

Arthur Ralph Douglas Elliot
by The Autotype Company, after Miss C.B. Leighton
NPG D20788

Michio Ito
by Alvin Langdon Coburn, published by Duckworth & Co
22 October 1915
NPG Ax7829

Richard Hamilton
by Richard Hamilton
NPG 5278

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