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What is the common formula of “Prussian blue is” and “Turn bull's blue”?

 Prussian blue is a dark blue pigment, the another name of Prussian blue is Berlin blue or Paris blue. It is formed by oxidation of ferrous ferrocyanide salts with FeCl3.

Colour of Prussian blue and turnbull’s blue is originated by charge transfer when electronic transition occurs from one part of the Complex to other part i.e such type are also called internal redox reaction (Charge transfer from metal  to metal). Intensity of clour in such type transition is very high as they do not require follow any selection rule.

“Prussian blue is” or “Turn bull's blue”

                                            “Turn bull's blue”

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