Steel blue is a shade of blue color that resembles blue steel, i.e., steel which has been subjected to bluing for protection from rust. It is one of the less vibrant shades of blue, and is usually identified as a blue-grey color.
The first recorded use of steel blue as a color name in English was in 1817.

In 1987, Steel blue was included as one of the X11 colors, later also known as the X11 web colors after the invention of the World Wide Web in 1991.

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