The Cyanotype Process

What is Cyanotype?

Cyanotype is a historic photographic printing process that produces distinctive cyan-blue prints. Invented in 1842 by Sir John Herschel, this technique has been used by artists and botanists for nearly two centuries to create stunning blue images.

 

The Process

Preparing the Solution: The cyanotype process begins with mixing two light-sensitive chemicals: ferric ammonium citrate and potassium ferricyanide. When combined, these create a photosensitive solution.

Coating: I carefully coat paper or fabric with this solution in a darkened room, then allow it to dry completely. The coated surface becomes light-sensitive and must be kept away from UV light until ready to expose.

Creating the Image: Objects such as pressed flowers, leaves, or transparent negatives are arranged on the coated surface. The composition is then placed under glass to keep everything flat and in contact with the paper.

Exposure: The prepared piece is exposed to UV light, either from the sun or a UV light source. The exposure time varies depending on the light intensity, typically ranging from 10 to 30 minutes. During this time, the areas exposed to light turn a pale greenish-gray.

Development: After exposure, the print is rinsed in water. As the water washes away the unexposed chemicals, the image emerges in its characteristic Prussian blue color. The areas that were covered by objects remain white or light, creating a negative image.

Drying & Oxidation: As the print dries and oxidizes in the air, the blue deepens and intensifies, revealing the final rich cyan tones.

Why Cyanotype?

Each cyanotype is a unique, handmade print. The organic nature of the process means that no two prints are exactly alike. The beautiful blue tones and the way natural objects are captured in silhouette create ethereal, timeless artwork that celebrates both nature and photographic history.