As described in this section of "The Chemistry of Photography",
By William Jerome Harrison the Cyanotype process is very unique.
The simple mixture of Iron Salts, coated on to watercolor paper and exposed to sunlight creates a latent image in a grayish tone. Once washed the unexposed chemistry is removed leaving a dark blue image on a paper white ground.
Below are two recent examples using digital negatives i created from a rendering of the sailing ship The Evangeline, and Kate's Light, the renderings where created by virtual artist R.J. Cote.
want to see a how to video? check this out
Digital Cyanotype from matthew shapoff on Vimeo.
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