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Cyanotypes are one of the oldest photographic processes in the history of photography. Watercolor paper is coated with a mixture of ferric ammonium citrate and potassium ferricyananide. The object to be printed is laid on the surface and exposed to sunlight which creates a Prussian Blue color. Water is then used to wash away the sensitizer solution and the blue darkens as the print dries to reveal the final product. Wet Cyanotype includes the addition of water, vinegar, soap suds and spices such as turmeric to create variations in the final print.
© Karen Lamphere