Colors Encyclopedia

Named color

Dark Slate Grey

Dark Slate Grey color #2F4F4F: RGB 47, 79, 79 and HSL 180°, 25%, 25%. Explore its cool cyan profile, contrast, CSS, palettes and harmonies.

#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

Use this color

Create with Dark Slate Grey

Open a professional color tool with #2F4F4F already applied. Each configuration stays canonical to the tool and can be adjusted or shared.

All color tools
Generate palette & CSS variablesCreate 50–950 tokens and export CSS, SCSS, JSON, or Tailwind.Open configured tool →Open in Gradient StudioStart with Dark Slate Grey and its complementary color.Open configured tool →Mix this colorBlend it with a complementary color and copy color-mix() CSS.Open configured tool →Check contrastOpen the strongest black or white background pairing.Open configured tool →Accessible combinationsReview AA and AAA text options, alternatives, warnings, and UI guidance.Open configured tool →Create glass surfaceUse this color as the tint for a translucent UI panel.Open configured tool →

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

Color meaning and use

About Dark Slate Grey Color

Dark Slate Grey uses HEX #2F4F4F, RGB 47, 79, 79, and HSL 180°, 25%, 25%. The dataset classifies it in the cyan family with cool temperature and muted visual character.

No separate named-color neighbor is recorded for this entry. Its relative luminance is 0.0676; black contrast is 2.35:1 and white contrast is 8.93:1, making white the stronger of those two standard foreground choices.

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

Downloadable color reference infographic

Dark Slate Grey Color Reference Infographic

Save a high-resolution infographic of Dark Slate Grey, including its color values, coordinated palette, and black and white text contrast.

1200 × 800
Dark Slate Grey color reference infographic showing #2F4F4F, RGB and HSL values, a coordinated palette, and black and white text contrast.
Dark Slate Grey color reference infographic generated from the verified Colors Encyclopedia dataset.
Download WebPDownload SVGOpen full size

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#304050Matte Black#1A1A1AWhite Smoke#F5F5F5

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",
    "/tools/css-gradient-generator",
    "/tools/color-palette-generator",
    "/tools/css-color-mixer",
    "/tools/contrast-checker"
  ],
  "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",
      "/tools/css-gradient-generator",
      "/tools/color-palette-generator",
      "/tools/css-color-mixer",
      "/tools/contrast-checker"
    ]
  }
}
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",
    "/tools/css-gradient-generator",
    "/tools/color-palette-generator",
    "/tools/css-color-mixer",
    "/tools/contrast-checker"
  ],
  "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",
      "/tools/css-gradient-generator",
      "/tools/color-palette-generator",
      "/tools/css-color-mixer",
      "/tools/contrast-checker"
    ]
  },
  "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

Similar Colors

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

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.