Properties
Prussian blue is a microcrystalline blue powder. It is insoluble, but the crystallites tend to form a colloid. Such colloids can pass through fine filters. Despite being one of the oldest known synthetic compounds, the composition of Prussian blue remained uncertain for many years. The precise identification of Prussian blue was complicated by three factors:
- Prussian blue is extremely insoluble but also tends to form colloids;
- Traditional syntheses tend to afford impure compositions;
- Even pure Prussian blue is structurally complex, defying routine crystallographic analysis.
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