Potassium ferricyanide

Potassium ferricyanide
The chemical used in Farmer's reducer as a bleach.
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Potassium ferricyanide - chemical used in Farmer's reducer as a bleach.
Potassium hydroxide - caustic potash. Highly active alkali, used as the basis for high contrast developing solutions.

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The paper or other surface is treated with chemicals such as aqueous potassium ferricyanide and aqueous ferric ammonium citrate.

Invented by Herschel in 1842, Cyanotype produces characteristic Prussian Blue images through the combination of iron salts with potassium ferricyanide.

Potassium ferricyanide
They result in a photo-sensitive solution when dissolved in water, which is used to coat a material (usually paper).

Farmer's reducer
a chemical solution of potassium ferricyanide and sodium thiosulfate that is used to reduce the density and increase the contrast of developed film. (Named after its inventor Howard Farmer).

The chemicals involved in cyanotype photography include Prussian blue, aqueous potassium ferricyanide and aqueous ferric ammonium citrate. When producing a cyanotype picture, the paper (or other printing medium) is treated with each of the chemicals.

See also: Photograph, Print, Prints, Photography, Blue