Meaning of iron blue

i'ron blue'

Pronunciation: [key]
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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