Cyanotypes

Cyanotype

The cyanotype is an early photographic printing process known for its striking blue-and-white images. It was invented in 1842 by Sir John Herschel, primarily as a way to copy notes and diagrams. However, it’s best known for its use by Anna Atkins, who used it to create botanical studies and is often credited as the first female photographer.

The process is simple and non-toxic, which made it popular both historically and in modern alternative photography.

To make a cyanotype, paper (or fabric) is coated with a solution of ferric ammonium citrate and potassium ferricyanide, then dried in the dark. When exposed to sunlight with an object or negative on top, the areas hit by UV light turn a deep blue. After exposure, the print is rinsed in water, which washes away unexposed chemicals and reveals the image.

Cyanotypes are valued for their distinctive Prussian blue color, ease of use, and artistic versatility. The process remains a favorite among artists, educators, and photographers today.