Wiktionary
iron gray
a. Of a dark grey colour, with a tint of green. alt. A dark grey colour, with a tint of green. n. A dark grey colour, with a tint of green.
Usage examples of "iron gray".
Nail's free hand brushed a wisp of iron gray hair off her forehead, but her gaze remained fixed on him.
That she could speak if she wanted to, and that others around her were crying too, that the woman with the iron gray hair was crying, and that the poor black-haired woman who had been crying all along was sobbing silently against the chest of the man beside her, and that the faces of those who didn't cry –.
His father-in-law had iron gray hair and the black eyes Maris had inherited, and looked as if he ate nails for breakfast.