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Product Description
Prussian blue is a dark blue pigment with the idealized chemical formula Fe7(CN)18. To better indicate the structure of this complex compound the formula can also be written as Fe4[Fe(CN)6]3 · xH2O. Another name for the color is Berlin blue or, in painting, Parisian or Paris blue. Turnbull's blue is the same substance, but is made from different reagents, and its slightly different color stems from different impurities. Prussian blue was the first modern synthetic pigment. It is prepared as a very fine colloidal dispersion, because the compound is not soluble in water. It contains variable amounts of other ions and its appearance depends sensitively on the size of the colloidal particles. The pigment is used in paints, and it is the traditional "blue" in blueprints and aizuri-e Japanese woodblock prints.
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