WHAT IS A CYANOTYPE?
Cyanotypes are prints created by exposing treated paper (or other medium) to sunlight in order to imprint an image onto the paper with typically a cyan-blue tint. The paper or other surface is treated with chemicals such as aqueous potassium ferricyanide and aqueous ferric ammonium citrate. A positive image may be produced by exposing the treated paper to a source of ultraviolet light such as the sun and then developing and washing the print, washing away water-soluble salts and leaving non-water-soluble Prussian blue in the paper. Objects that are relatively flat and opaque may be successfully printed using cyanotype photography. (SOURCE: http://56x56.com/resources/photography-printing-glossary/)
The English scientist and astronomer Sir John Herschel discovered this procedure in 1842. Though the process was developed by Herschel, he considered it as mainly a means of reproducing notes and diagrams, as in blueprints. It was Anna Atkins who brought this to photography. She created a limited series of cyanotype books that documented ferns and other plant life from her extensive seaweed collection. Atkins placed specimens directly onto coated paper, allowing the action of light to create a sillhouette effect. By using this photogram process, Anna Atkins is regarded as the first female photographer. (Source: http://en.wikipedia.org/wiki/Cyanotype)
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CYANOTYPE--AFRICAN AMERICAN WOMAN IN HAT