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Cyanotypes

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.[1] Though the process was developed by Herschel, he considered it as mainly a means of reproducing notes and diagrams, as in blueprints.[2] 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.[3] 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.[4] (Source: http://en.wikipedia.org/wiki/Cyanotype)

 

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CYANOTYPE--AFRICAN AMERICAN WOMAN IN HAT
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