1997/8 Hidden Worlds, John Thomson in China an exhibition curated by Richard Ovenden assisted by Michael Gray. The most comprehensive and extensive exhibition devoted to date of the life and work of John Thomson. Showing a large number of original photographs and publications from the archives of the National Library of Scotland, the National Museum of Photography film and Television, the Science Museum, Bradford and several private sources. The exhibition also includes a number of images exhibited for the first time. The National Library commissioned Barbara and Michael Gray to reprint 72 of John Thomson’s original wet collodion negatives from the Wellcome Institute for the History of Medicine’s Iconographic Collection. The prints were made on albumen paper and toned with a combination of gold, platinum and palladium salts.

Shown at the National Library of Scotland, Edinburgh and at the Fox Talbot Museum, Lacock