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Prussian blue
Prussian blue is a dark blue pigment with the idealised formula Fe7(CN)18. Another name for the colour Prussian blue is Berlin blue or, in painting, Parisian blue. Turnbull's blue is the same substance but is made from different reagents.
Prussian blue was one of the first synthetic pigments. It is employed as a very fine colloidal dispersion, as the compound itself is not soluble in water. It is famously complex, owing to the presence of variable amounts of other ions and the sensitive dependence of its appearance on the size of the colloidal particles formed when it is made. The pigment is used in paints, and it is the traditional "blue" in blueprints.
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- Industry/Domain: Inorganic chemicals
- Category: Inorganic pigments
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