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The Cyanotype process yields a blue image on a white (or paper base color) background. The paper is sized (treated) with a starch or egg albumen solution.
The paper is then coated with an emulsion mixed from an iron salt (Ammonio-citrate of iron). The paper is then dried in the dark. Immediately after drying, the paper is contact printed from a negative in the sun or other similar light source (i.e. mercury vapor lamp). Next, it is thoroughly washed & dried. Although I am not enthralled by the prospect of making blue images, artists like early 19th century Clarence White & Gustav LeSecq made some remarkable images with this process.
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