iron blue

noun
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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Wastewater treatment sludge from the production of iron blue pigments.
Wastewater treatment sludge from the production of iron blue pigments.
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