cyanotyping

Cyanotypes: A brief history of discovery, process and application - by Craig Keenan

In 1842 Sir John Herschel came up with the process of cyanotyping as a cost effective means of reproducing notes and diagrams. A friend and colleague of his, Anna Atkins, later used the technique to produce the worlds first photographically illustrated book, Photographs of British Algae: Cyanotype Impressions.