Cyanotype is a process used in both artistic and technical illustration. The material is coated in a mildly photosensitive chemical (potassium ferricyanide and ferric ammonium citrate mixed together) and then left to dry in a darkroom. The material then has a semi-transparent object placed upon it, such as a bottle, leaf, or an image printed on acetate. The paper is left to expose for about 30 minutes, then the chemicals washed off with running water.
Below are some examples of different types of Cyanotypes
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