Definition of "steel-blue" [steel-blue]

• Of a lustrous dark-bluish color, resembling steel tempered blue.
• A lustrous dark-bluish color; a darker shade than Berlin blue and less chromatic, but nearly of the same hue. See blue. (noun)

The Century Dictionary (Public Domain)

• "Her ragged bathroom belly flaunting retro-blue-frosted polished stumps stiff to the touch squat reflection on her steel-blue veins the rest of her remains, a goth-inspired charcoal disposable beloved,"
• "The attractive lavender-gray surfaces gradually change to steel-blue at the borders."
• "The Copper Beeches and Aspens spangle goldenly against the steel-blue sky."