Cyanotype is a photographic printing process, historically used to mach copy of engineering drawing, commonly known as ‘blueprints’. Cyanotypes can be produced on almost any porous surface, such as paper, fabric and wood.
A solution combining potassium ferricyanide and ferric ammonium citrate is applied to the surface of the paper (or other material), and left to dry.
When placed under UV light a chemical reaction takes place. Any areas of the surface exposed to the UV will turn a deep green, while while any covered areas will be yellow. To acquire the desirable deep blue, the images must be fully rinsed in water.
Images can be created using acetate, by printing an image on to it or drawing directly onto it. Photograms can also be made, by placing objects between the UV source and the paper.
We used a light box to develop our cyanotypes, the box created a vacuum squishing you paper and image source flat. This is what produce the beautifully fine creases on the glove. Without the use go the vacuum this print would not have been as effective, for-instance if it had just been placed outside under the sun.
The blue image can be intensified by further rinsing the image in a solution of Hydrogen peroxide (then rinsing it again with water).