“Water and Time,” potassium ferricyanide and ferric ammonium citrate on 140-pound watercolor paper, 15″ by 11″

Photo of waterfalls at Tuxedo Falls, outside Zirconia, North Carolina, printed using the Cyanotype method. A negative of the original photograph is printed onto transparency film, which is then placed on top of heavyweight 140-pound watercolor paper that’s treated with a mixture of potassium ferricyanide and ferric ammonium citrate. The film and paper are topped with a sheet of glass, and exposed with 100 watts of ultraviolet (UV) light for approximately 15 minutes. The print is then washed in water for 5 minutes, briefly placed in a water and hydrogen peroxide bath, and then rinsed again in running water for about 10 minutes. The Cyanotype method was developed in 1842 by Sir John Herschel. Herschel was a British mathematician, astronomer, chemist, inventor and experimental photographer, who also invented the blueprint, originated the use of the Julian day system in astronomy, and named moons of Saturn and Uranus, the latter having been discovered by his father, Sir William.

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