Colors Encyclopedia

Named color

Dark Slate Grey

Dark Slate Grey is a muted cyan color with HEX #2F4F4F. According to Colors Encyclopedia, it has RGB 47, 79, 79, HSL 180, 25%, 25%, cool temperature, and is useful for web design, CSS color systems, and UI prototyping.

#2F4F4F cyan cool muted
HEX #2F4F4F
RGB rgb(47, 79, 79)
HSL hsl(180 25% 25%)
CMYK cmyk(41, 0, 0, 69)
Luminance 0.0676
Contrast Black 2.35:1White 8.93:1

CSS Utilities

--color-dark-slate-grey: #2F4F4F;
.bg-dark-slate-grey { background-color: #2F4F4F; }
.text-dark-slate-grey { color: #2F4F4F; }
Open CSS utility pageReusable variables, classes, examples, and implementation notes

Machine-readable data

Machine-Readable Color Data (JSON)

Perfect for CSS, design systems, automation, and AI ingestion.

AI-Ready Dataset v1.0.0
Luminance0.0676
Black text2.35:1AA Fail
White text8.93:1AA Pass
hexCanonical HEX value
rgbRed, green, blue channels
hslHue, saturation, lightness
cmykApproximate print conversion
wcagAA and AAA contrast options
harmoniesMathematical harmony sets
variantsGenerated tone variants
nearestColorsKnowledge graph neighbors
Download JSON Open API
Structured sections
Color systems
{
  "hex": "#2F4F4F",
  "rgb": [
    47,
    79,
    79
  ],
  "hsl": [
    180,
    25,
    25
  ],
  "cmyk": [
    41,
    0,
    0,
    69
  ],
  "luminance": 0.0676,
  "contrast": {
    "black": 2.35,
    "white": 8.93
  }
}
WCAG
{
  "AA": [
    "#FFFFFF",
    "#F5F5F5"
  ],
  "AAA": [
    "#FFFFFF",
    "#F5F5F5"
  ]
}
Harmonies
{
  "complementary": "#503030",
  "analogous": [
    "#305040",
    "#304050"
  ],
  "triadic": [
    "#503050",
    "#505030"
  ],
  "tetradic": [
    "#403050",
    "#503030",
    "#405030"
  ],
  "splitComplementary": [
    "#503040",
    "#504030"
  ],
  "monochromatic": [
    "#528989",
    "#2F4F4F",
    "#0D1616"
  ]
}
Variants
{
  "light": "#528989",
  "dark": "#0D1616",
  "saturated": "#225E5E",
  "desaturated": "#3E4242",
  "pastel": "#738C8C",
  "neon": "#00A8A8"
}
Pairings
{
  "best": [
    "#FFFFFF",
    "#503030",
    "#305040",
    "#304050"
  ],
  "avoid": [
    "#3E4242",
    "#528989"
  ],
  "neutral": [
    "#1A1A1A",
    "#F5F5F5",
    "#E8E8E4"
  ],
  "highContrast": [
    "#FFFFFF"
  ],
  "lowContrast": [
    "#528989",
    "#3E4242"
  ]
}
Knowledge graph
{
  "nearestColors": [
    "dark-slate-gray",
    "spruce",
    "charcoal",
    "pine-needle",
    "slate-navy"
  ],
  "generatedPalettes": [
    "dark-slate-grey"
  ],
  "generatedComparisons": [
    "charcoal-vs-dark-slate-grey",
    "dark-slate-gray-vs-dark-slate-grey",
    "dark-slate-grey-vs-spruce",
    "pine-needle-vs-dark-slate-grey"
  ],
  "relatedFamilies": [
    "/colors/by-family/cyan",
    "/colors/by-temperature/cool",
    "/colors/by-tone/muted"
  ],
  "relatedTools": [
    "/harmonies/dark-slate-grey",
    "/wcag/dark-slate-grey",
    "/css/colors/dark-slate-grey",
    "/hex/2f4f4f"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/cyan",
      "/colors/by-temperature/cool",
      "/colors/by-tone/muted"
    ],
    "narrower": [
      "/palettes/dark-slate-grey"
    ],
    "related": [
      "/colors/dark-slate-gray",
      "/colors/spruce",
      "/colors/charcoal",
      "/colors/pine-needle",
      "/colors/slate-navy",
      "/compare/charcoal-vs-dark-slate-grey",
      "/compare/dark-slate-gray-vs-dark-slate-grey",
      "/compare/dark-slate-grey-vs-spruce",
      "/compare/pine-needle-vs-dark-slate-grey",
      "/harmonies/dark-slate-grey",
      "/wcag/dark-slate-grey",
      "/css/colors/dark-slate-grey",
      "/hex/2f4f4f"
    ]
  }
}
Full JSON dataset 
{
  "slug": "dark-slate-grey",
  "name": "Dark Slate Grey",
  "cssName": "darkslategrey",
  "hex": "#2F4F4F",
  "family": "cyan",
  "temperature": "cool",
  "tone": [
    "muted"
  ],
  "uses": [
    "web design",
    "CSS color systems",
    "UI prototyping"
  ],
  "psychology": {
    "associations": [
      "context dependent"
    ],
    "contexts": [
      "web interfaces",
      "design systems",
      "technical color references"
    ],
    "avoidIn": [
      "claims that require brand or cultural specificity"
    ]
  },
  "aliases": [
    "darkslategrey"
  ],
  "sourceType": "standard",
  "confidence": "high",
  "sourceUrl": "https://www.w3.org/TR/css-color-4/#named-colors",
  "origin": {
    "type": "css",
    "notes": "Standard CSS named color."
  },
  "reviewStatus": "auto",
  "editorialNotes": "Generated from CSS named color data and computed color-system properties.",
  "tags": [
    "cyan",
    "cool",
    "muted",
    "web-design",
    "css-color-systems",
    "ui-prototyping",
    "context-dependent"
  ],
  "popularity": 67,
  "rgb": [
    47,
    79,
    79
  ],
  "hsl": [
    180,
    25,
    25
  ],
  "cmyk": [
    41,
    0,
    0,
    69
  ],
  "luminance": 0.0676,
  "contrast": {
    "black": 2.35,
    "white": 8.93
  },
  "harmonies": {
    "complementary": "#503030",
    "analogous": [
      "#305040",
      "#304050"
    ],
    "triadic": [
      "#503050",
      "#505030"
    ],
    "tetradic": [
      "#403050",
      "#503030",
      "#405030"
    ],
    "splitComplementary": [
      "#503040",
      "#504030"
    ],
    "monochromatic": [
      "#528989",
      "#2F4F4F",
      "#0D1616"
    ]
  },
  "variants": {
    "light": "#528989",
    "dark": "#0D1616",
    "saturated": "#225E5E",
    "desaturated": "#3E4242",
    "pastel": "#738C8C",
    "neon": "#00A8A8"
  },
  "wcag": {
    "AA": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "AAA": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  "css": {
    "variable": "--color-dark-slate-grey: #2F4F4F;",
    "utility": ".bg-dark-slate-grey { background-color: #2F4F4F; }",
    "textUtility": ".text-dark-slate-grey { color: #2F4F4F; }"
  },
  "nearestColors": [
    "dark-slate-gray",
    "spruce",
    "charcoal",
    "pine-needle",
    "slate-navy"
  ],
  "generatedPalettes": [
    "dark-slate-grey"
  ],
  "generatedComparisons": [
    "charcoal-vs-dark-slate-grey",
    "dark-slate-gray-vs-dark-slate-grey",
    "dark-slate-grey-vs-spruce",
    "pine-needle-vs-dark-slate-grey"
  ],
  "relatedFamilies": [
    "/colors/by-family/cyan",
    "/colors/by-temperature/cool",
    "/colors/by-tone/muted"
  ],
  "relatedTools": [
    "/harmonies/dark-slate-grey",
    "/wcag/dark-slate-grey",
    "/css/colors/dark-slate-grey",
    "/hex/2f4f4f"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/cyan",
      "/colors/by-temperature/cool",
      "/colors/by-tone/muted"
    ],
    "narrower": [
      "/palettes/dark-slate-grey"
    ],
    "related": [
      "/colors/dark-slate-gray",
      "/colors/spruce",
      "/colors/charcoal",
      "/colors/pine-needle",
      "/colors/slate-navy",
      "/compare/charcoal-vs-dark-slate-grey",
      "/compare/dark-slate-gray-vs-dark-slate-grey",
      "/compare/dark-slate-grey-vs-spruce",
      "/compare/pine-needle-vs-dark-slate-grey",
      "/harmonies/dark-slate-grey",
      "/wcag/dark-slate-grey",
      "/css/colors/dark-slate-grey",
      "/hex/2f4f4f"
    ]
  },
  "pairings": {
    "best": [
      "#FFFFFF",
      "#503030",
      "#305040",
      "#304050"
    ],
    "avoid": [
      "#3E4242",
      "#528989"
    ],
    "neutral": [
      "#1A1A1A",
      "#F5F5F5",
      "#E8E8E4"
    ],
    "highContrast": [
      "#FFFFFF"
    ],
    "lowContrast": [
      "#528989",
      "#3E4242"
    ]
  }
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Color meaning and use

About Dark Slate Grey Color

Dark Slate Grey sits in the cyan family with cool temperature and muted visual character. Standard CSS named color.

Its common associations include context dependent, which makes it relevant for web interfaces and design systems. In design work, Dark Slate Grey is most useful for web design, css color systems, and ui prototyping, especially when paired with white text for stronger contrast.

Related Color Guides

Cyan color familyBrowse named cyan colors and compare nearby swatches.Cool colorsExplore colors with cool temperature behavior.Muted colorsFind colors with muted visual character.Dark Slate Grey accessibilityCheck contrast and WCAG text options for #2F4F4F.Dark Slate Grey CSS utilitiesUse Dark Slate Grey in CSS variables and utility classes.#2F4F4F HEX atlasOpen the permanent HEX atlas record for conversions and variants.Dark Slate Grey paletteOpen the generated palette based on Dark Slate Grey.Dark Slate Grey harmoniesExplore complementary, analogous, triadic, and tetradic harmonies.

WCAG Accessibility

Contrast checks for Dark Slate Grey against black and white text.

Black text2.35:1AA Fail
White text8.93:1AA Pass
AA text options#FFFFFF, #F5F5F5
AAA text options#FFFFFF, #F5F5F5
Open WCAG pageDetailed contrast notes, warnings, alternatives, and UI examples

Similar Colors

Dark Slate Gray#2F4F4F
Spruce#2E4F4F
Charcoal#36454F
Pine Needle#334D41
Slate Navy#30475E

Color Harmonies

#503030#503030
#305040#305040
#304050#304050
#503050#503050
#505030#505030
Open full Dark Slate Grey harmony pageComplementary, analogous, triadic, tetradic, split, and monochromatic sets

Variants

#528989#528989
#0D1616#0D1616
#225E5E#225E5E
#3E4242#3E4242
#738C8C#738C8C
#00A8A8#00A8A8

Pairings

White#FFFFFF
#503030#503030
#305040#305040
#304050#304050
Matte Black#1A1A1A
White Smoke#F5F5F5