As a botanist and early photographer, Anna Atkins quickly realised the benefit of using the cyanotype process to record specimens of plant life, such as this poppy. Cyanotype was invented by the astronomer Sir John Herschel in 1842. The following year, Atkins became the first person to print and publish a photographically illustrated book, British Algae, Cyanotype Impressions, part 1. To make a ‘photogram’ with the cyanotype process, the photographer laid an object on paper impregnated with iron salts, then exposed the paper to sunlight for a few minutes. When washed in water, the area where the plant had blocked the light remained white, but the area that was exposed came out a rich blue.