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iron blue

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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 of iron blue

First recorded in 1690–1700

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for iron blue

Historical Examples of iron blue

His bare head, with its clustered, red-brown hair, looked quite wonderful in the setting of golden leaves and iron-blue grapes.
Shadows of Flames
Amelie Rives