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Potassium ferricyanide

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Product details:

- Product Name: Potassium ferricyanide

- Formulas : K3Fe(CN)6

- Chemical composition : China-technical-25kg

- Product Type: Chemical for mining

Product description :


Potassium ferricyanide is the chemical compound with the formula K3[Fe(CN)6]. This bright red salt contains the octahedrally coordinated[Fe(CN)6]3− ion.[2] It is soluble in water and its solution shows some green-yellow fluorescence.


In 19th century, it was used for reading palimpsests and old manuscripts.[3]

The compound has widespread use in blueprint drawing and in photography (Cyanotype process). Iron and copper toning involve the use of potassium ferricyanide. Potassium ferricyanide is used as an oxidizing agent to remove silver from negatives and positives, a process called dot etching. In color photography, potassium ferricyanide is used to reduce the size of color dots without reducing their number, as a kind of manual color correction. The compound is also used to harden iron and steel, in electroplatingdyeing wool, as a laboratory reagent, and as a mild oxidizing agent in organic chemistry. It is also used in black-and-white photography with sodium thiosulfate (hypo)[4] to reduce the density of a negative or gelatin silver print where the mixture is known as Farmer++++s reducer; this can help offset problems from overexposureof the negative, or brighten the highlights in the print.

Potassium ferricyanide is also one of two compounds present in ferroxyl indicator solution (along with phenolphthalein) which turns blue (Prussian blue) in the presence of Fe2+ ions, and which can therefore be used to detect metal oxidation that will lead to rust. It is possible to calculate the number of moles of Fe2+ ions by using a colorimeter, because of the very intense color of Prussian blue Fe4[Fe(CN)6]3.

Potassium ferricyanide is often used in physiology experiments as a means of increasing a solution++++s redox potential (E°++++ ~ 436 mV at pH 7).Sodium dithionite is usually used as a reducing chemical in such experiments (E°++++ ~ −420 mV at pH 7).

Potassium ferricyanide is used in many amperometric biosensors as an electron transfer agent replacing an enzyme++++s natural electron transfer agent such as oxygen as with the enzyme glucose oxidase. It is used as this ingredient in many commercially available bloodglucose meters for use by diabetics.

Potassium ferricyanide is the main component of Murakami++++s etchant for cemented carbides.

[edit]Prussian blue

Prussian blue, the deep blue pigment in blue printing, is generated by the reaction of K3[Fe(CN)6] with ferrous (Fe2+) ions.[5]

In histology, potassium ferricyanide is used to detect ferrous iron in biological tissue, as the stain Perls++++ Prussian blue. In this reaction, potassium ferricyanide reacts with ferrous iron in acidic solution to produce an insoluble blue pigment, and both the stain and the pigment are commonly referred to as Turnbull++++s blue. To detect ferric (Fe3+) iron, potassium ferrocyanide is used instead; the stain and pigment produced are commonly known as Prussian blue.[6] It has been found that the compound formed in the Turnbull++++s blue reaction and the compound formed in the Prussian blue reaction are the same unique compound, Prussian blue.[7][8]


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