Prussian blue
noun
Prus·sian blue
ˈprə-shən-
1
: any of numerous blue iron pigments formerly regarded as ferric ferrocyanide
2
: a dark blue crystalline hydrated ferric ferrocyanide Fe4[Fe(CN)6]3·xH2O used as a test for ferric iron
3
: a greenish blue
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Merriam-Webster unabridged
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