Noun: iron blue I(-u)rn bloo
- Slightly purplish or bluish dark grey
"The building's iron blue facade stood out against the sky";
- steel grey [Brit, Cdn], steel gray [US], Davy's grey [Brit, Cdn], Davy's gray [US]
- Any of various blue pigments
"The painter mixed iron blue into the sky colours";
- Prussian blue
Derived forms: iron blues
Type of: gray [US], grayness [US], grey [Brit, Cdn], greyness [Brit, Cdn], pigment