the.com/steel blue

means A cool, grayish-blue with a hard metallic cast, like the sheen on polished steel.

from A straightforward compound naming the color after the metal itself — steel's own blue-gray gleam, the color it shows when cooled, tempered, or freshly cut. The term settles into English color vocabulary alongside other metal-named hues (silver, gold, bronze), borrowing credibility and coldness from the alloy rather than from any dye or pigment.