Slate gray

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Slate gray
About these coordinates     Color coordinates
Hex triplet#708090
sRGBB (r, g, b)(112, 128, 144)
HSV (h, s, v)(210°, 22%, 56%)
CIELChuv (L, C, h)(53, 17, 239°)
ISCC–NBS descriptorGrayish blue
B: Normalized to [0–255] (byte)
Slate roof
Slate as a tertiary color

Slate gray is a gray color with a slight azure tinge that is a representation of the average color of the material slate. As a tertiary color, slate is an equal mix of purple and green pigments.[2][3]

Slaty, referring to this color, is often used to describe birds.

The first recorded use of slate gray as a color name in English was in 1705.[4]


Light slate gray[edit]

Light slate gray
About these coordinates     Color coordinates
Hex triplet#778899
sRGBB (r, g, b)(119, 136, 153)
HSV (h, s, v)(210°, 22%, 60%)
CIELChuv (L, C, h)(56, 19, 239°)
ISCC–NBS descriptorGrayish blue
B: Normalized to [0–255] (byte)

Displayed at right is the web color light slate gray.[5]

Dark slate gray[edit]

Dark slate gray
About these coordinates     Color coordinates
Hex triplet#2F4F4F
sRGBB (r, g, b)(47, 79, 79)
HSV (h, s, v)(180°, 41%, 31%)
CIELChuv (L, C, h)(31, 14, 192°)
ISCC–NBS descriptorDark bluish green
B: Normalized to [0–255] (byte)

Displayed at right is the web color dark slate gray.[6]

In human culture[edit]


Mid-1980s supercomputer Thinking Machines CM-1 (the Connection Machine) at the Computer History Museum in Mountain View, California. One of the face plates has been partially removed to show the circuit boards inside.
IBM Roadrunner supercomputer—the fastest supercomputer in the world in May 2008, it could operate at a speed of 1.026 petaflops
  • The exterior shells of supercomputers are often colored various shades of slate gray.
  • The iPhone 5 and the iPad Mini comes in a Dark slate gray colored aluminum body contrasted with black.
  • Western Electric used the term SLATE for the color instead of gray in their 25-pair (and multiples) cable for pairs 5-10-15-20-25.


The New York City Subway shuttle bullet, used on three New York City Subway shuttle services.
  • The S New York City Subway service bullet, used in three out of the system's 28 services, is colored slate gray.


  • The Fleet Air Arm aircraft Temperate Day Scheme in the World War Two was Dark Slate Grey over Extra Dark Sea Grey on top sides and Sky on undersides. This scheme was referred as "slime over sludge".

See also[edit]


  1. ^ RGB approximations of RYB tertiary colors, using cubic interpolation."RYB RGB conversion". Archived from the original on 28 June 2013. Retrieved 29 December 2012. The colors displayed here are substantially paler than the true colors a mixture of paints would produce.
  2. ^ William J. Miskella, 1928, Practical Color Simplified: A Handbook on Lacquering, Enameling, Coloring And Painting, pp.[page needed]
  3. ^ John Lemos, 1920, "Color Charts for the School Room", in School Arts, vol. 19, pp. 580–584.
  4. ^ Maerz and Paul. A Dictionary of Color. New York: 1930. McGraw-Hill. Page 204; Color Sample of Slate Gray: Page 51, Plate 14, Color Sample A2.
  5. ^ "Light slate gray".
  6. ^ "Dark slate gray".