Prussian blue

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Prussian blue (Fe7(CN)18) is an intensive blue pigment, an iron cyanide compound that is safe to handle since the iron and cyanide is so strongly bonded.

Prussian blue was the basis from which hydrogen cyanide was first produced and the name cyanide comes from the Greek word for blue. Under strongly acidic conditions deadly hydrogen cyanide gas will be released.


Mixing concentrated acids with prussian blue will release highly toxic hydrogen cyanide gas.

CAS number : 14038-43-8

Physical properties

Molecular weight : 859.24

Testing for iron

Prussian blue is the resulting blue precipitate when testing for iron ions with potassium ferrocyanide or potassium ferricyanide


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