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iron blue

noun
1.
any of the class of blue pigments having a high tinting strength and ranging in shade and in coloring properties from reddish blue to jet blue: used chiefly in the manufacture of paints and printing inks.
Origin
1690-1700
1690-1700
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for iron blue
  • Wastewater treatment sludge from the production of iron blue pigments.
  • Wastewater treatment sludge from the production of iron blue pigments.

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4
5
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