Potassium Ferrocyanide

Other Trading Names:

  • Potassium Hexacyanoferrate(II)
  • Potassium Hexacyanoferrate
  • Potassium Hexacyanoiron(II)
  • Yellow Prussiate of Potash
  • E536 (European food additive code)

CAS Number: 13943-58-3

HS Code: 28371000

Types of Packaging:

  • 25 Kg/ Woven Bag
  • 180 Kg/ Fiber Drum
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Potassium Ferrocyanide

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Molecular Formula



Pale yellow


Crystalline powder


99% min


Soluble in water

Molecular Weight

368.35 g/mol


1.85 g/cm³




0.5% max

Iron Content

0.01% max

Heavy Metals

0.001% max

Insoluble Matter

0.01% max

Melting Point


Chemical Description

  • Potassium Ferrocyanide, known as potassium hexacyanoferrate(II), has the chemical formula C6N6FeK3.
  • It's a pale yellow, crystalline solid, odorless and non-toxic, with high water solubility.
  • Industrially produced through a reaction between potassium cyanide and ferrous sulfate, followed by oxidation.
  • Used as a precursor for other potassium cyanide compounds and as a complexing agent in various chemical processes.
  • Also utilized in analytical chemistry to detect iron ions in solution and in the food industry as a food additive (E number E536).
  • Considered safe within regulatory limits, but proper handling and storage are essential.
  • Potassium Ferrocyanide's coordination chemistry allows stable complexes with various metal ions, finding applications in catalysis, materials science, and bioinorganic chemistry.
  • Apart from blue printing, it's used in photography for toning and developing, contributing to dye and pigment formation.
  • Electrochemical studies show promise in energy storage, sensors, and electrocatalysis.
  • In wastewater treatment, it's used to precipitate heavy metals and optimize metal removal processes.
  • While not combustible, cautious handling is necessary to prevent exposure to toxic cyanide gases.
  • Its versatility spans industrial sectors, from dyeing and printing to cutting-edge materials science and environmental applications.
  • Potassium Ferrocyanide's synthesis involves the reaction between potassium cyanide and ferrous sulfate, followed by oxidation, which was first documented in 1704 by German chemist Johann Conrad Dippel.
  • In addition to its use in toning and developing photographs, Potassium Ferrocyanide is also employed in lithography and photoengraving techniques.
  • Potassium Ferrocyanide's ability to form insoluble complexes with certain metal ions has led to its use in analytical chemistry for the detection and quantification of metal ions in solution.
  • The compound's applications extend beyond traditional industries, with emerging uses in nanotechnology and biomedical research, where its unique properties are harnessed for drug delivery and imaging purposes.
  • Research into Potassium Ferrocyanide's potential as a catalyst for organic transformations and green chemistry applications is ongoing, highlighting its importance in sustainable chemical processes.
  • Despite its widespread use, efforts are underway to monitor Potassium Ferrocyanide's environmental impact and develop eco-friendly alternatives and improve waste management practices.
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Potassium Ferrocyanide