Abstract
The printing of photographs in pure gold, rather than the ubiquitous medium of silver, was first achieved in 1842 by Sir John Herschel, but his innovative ‘chrysotype’ process was soon consigned to obscurity, owing to its expense and uncertain chemistry. In the 1980s some modern coordination chemistry of gold was applied to overcome the inherent problems, enabling an economic, controllable gold-printing process of high quality, which offers unique benefits for specialised artistic and archival photographic purposes. The colour of the gold image depends on the dimensions of the nanoparticles, which are controlled by the parameters of the photochemical process.
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