1911 ink photo St. Paul's Cathedral from the South from an etching by W. Walcot

Ink Photo, Sprague & Co., 4&5 East Harding Street, Fetter Lane, London EC. Double page from The Builder, 6 January, 1912. Is a bit discoloured/battered around the edges, otherwise good condition.

"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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