prussian blue

Noun
  1. Any of various blue pigments (synset 114947098)
    is a type of: pigment - dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.)
    same as: iron blue
  2. A dark greenish-blue color (synset 104976794)
    is a type of: blue, blueness - blue color or pigment; resembling the color of the clear sky in the daytime

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