iron blue
noun
1 iron blue
Slightly purplish or bluish dark grey.
synonyms: Davy's gray, Davy's grey, steel gray, steel grey.
2 iron blue
Any of various blue pigments.
synonym: Prussian blue.
Polish: błękit paryski, żelazocyjanek potasowo-żelazowy, heksacyjanożelazian(II) potasu żelaza(III), błękit berliński, błękit pruski
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