1905 ink photo The Frari from the Scuola di San Rocco, Venice

Ink Photo, Sprague & Co., 4&5 East Harding Street, Fetter Lane, London EC.  Double page from The Builder, September 10, 1905.

"In the 1880s, the London-based Sprague & Company patented a printing process they dubbed “Ink-Photo” which presented a lithographic application of collotype printing (heliography). In this process, a mirror plate was brushed with a light-sensitive chromogelatine emulsion. Through light exposure with the photographic negative, a salt grain structure corresponding to the photographic image resulted".  Source: The Melton Prior Institute.

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