SYN: Berlin blue.
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Prus·sian blue 'prəsh-ən-'blü n
1) any of numerous blue iron pigments formerly regarded as the ferric salt of ferrocyanide
2) a dark blue crystalline hydrated compound Fe4[Fe(CN)6]3·xH2O that is a ferrocyanide of iron and is used as a test for ferric iron called also ferric ferrocyanide
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an amorphous blue powder used as a dye; it is also administered orally in the treatment of known or suspected internal contamination with radioactive cesium and radioactive or nonradioactive thallium, to speed their elimination from the body. Called also Berlin b.Medical dictionary. 2011.