Colors Encyclopedia

Generated palette

Charcoal Blue Palette

Charcoal Blue Palette: #263238, #372B25, #253734, #252837. Check roles, contrast and CSS variables; open source-color links and JSON.

Charcoal Blue Palette assigns primary #263238, secondary #372B25, surface #253734, background #252837, accent #FFFFFF. The set spans Blue, Orange, Cyan, and Gray families with cool, warm, and neutral temperatures. Luminance runs from #252837 at 0.0219 to #FFFFFF at 1; black gives higher contrast on 1 of 5 values.

All palettesSource colorAPI
5colors
Blue palettedominant group
6use cases

Palette Color Roles

Charcoal Blue Palette maps 5 colors to practical UI roles for interfaces, brand systems, and CSS tokens.

Primary#263238Charcoal Blue
Secondary#372B25#372B25
Surface#253734#253734
Background#252837#252837
Accent#FFFFFFWhite

CSS Variables

--palette-charcoal-blue-primary: #263238;
--palette-charcoal-blue-secondary: #372B25;
--palette-charcoal-blue-surface: #253734;
--palette-charcoal-blue-background: #252837;
--palette-charcoal-blue-accent: #FFFFFF;

Accessibility Snapshot

Compare all 5 Charcoal Blue Palette values against black and white text, with the stronger standard foreground identified for each role.

Primary#263238
Black 1.6:1 · White 13.16:1
Best #FFFFFF
Secondary#372B25
Black 1.53:1 · White 13.69:1
Best #FFFFFF
Surface#253734
Black 1.67:1 · White 12.54:1
Best #FFFFFF
Background#252837
Black 1.44:1 · White 14.6:1
Best #FFFFFF
Accent#FFFFFF
Black 21:1 · White 1:1
Best #000000

UI Components Preview

Preview how the Charcoal Blue Palette roles behave together across common interface components before copying the CSS variables.

ButtonPrimary action with checked foreground contrast.
CardSurface treatment using palette roles.
AlertBackground, text, and accent roles together.
NavbarSecondary role with accent state.

Machine-readable data

Machine-Readable Charcoal Blue Palette Data (JSON)

Structured palette data for Charcoal Blue Palette, including color roles, accessibility, semantic groups, use cases, CSS variables, and API links.

AI-Ready Dataset v1.0.0
Luminance0.0298
Black text1.6:1AA Fail
White text13.16:1AA Pass
colorsPalette colors with roles and color systems
rolesPrimary, secondary, surface, background, and accent mapping
accessibilityContrast and WCAG text options by palette color
semanticGroupsAI-readable palette labels
useCasesDesign and implementation contexts
cssVariablesCopy-ready CSS custom properties
Download JSON Open API
Structured sections
Roles
[
  {
    "role": "primary",
    "hex": "#263238",
    "name": "Charcoal Blue"
  },
  {
    "role": "secondary",
    "hex": "#372B25",
    "name": "#372B25"
  },
  {
    "role": "surface",
    "hex": "#253734",
    "name": "#253734"
  },
  {
    "role": "background",
    "hex": "#252837",
    "name": "#252837"
  },
  {
    "role": "accent",
    "hex": "#FFFFFF",
    "name": "White"
  }
]
Accessibility
[
  {
    "role": "primary",
    "hex": "#263238",
    "name": "Charcoal Blue",
    "blackContrast": 1.6,
    "whiteContrast": 13.16,
    "bestTextColor": "#FFFFFF",
    "aaTextOptions": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "aaaTextOptions": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  {
    "role": "secondary",
    "hex": "#372B25",
    "name": "#372B25",
    "blackContrast": 1.53,
    "whiteContrast": 13.69,
    "bestTextColor": "#FFFFFF",
    "aaTextOptions": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "aaaTextOptions": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  {
    "role": "surface",
    "hex": "#253734",
    "name": "#253734",
    "blackContrast": 1.67,
    "whiteContrast": 12.54,
    "bestTextColor": "#FFFFFF",
    "aaTextOptions": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "aaaTextOptions": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  {
    "role": "background",
    "hex": "#252837",
    "name": "#252837",
    "blackContrast": 1.44,
    "whiteContrast": 14.6,
    "bestTextColor": "#FFFFFF",
    "aaTextOptions": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "aaaTextOptions": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  {
    "role": "accent",
    "hex": "#FFFFFF",
    "name": "White",
    "blackContrast": 21,
    "whiteContrast": 1,
    "bestTextColor": "#000000",
    "aaTextOptions": [
      "#000000",
      "#1A1A1A",
      "#36454F"
    ],
    "aaaTextOptions": [
      "#000000",
      "#1A1A1A",
      "#36454F"
    ]
  }
]
Semantic groups
[
  "charcoal blue palette",
  "generated palette",
  "blue palette",
  "orange palette",
  "cyan palette",
  "gray palette",
  "dark palette",
  "earth tone palette",
  "light palette",
  "neutral palette",
  "cool palette",
  "warm palette"
]
Use cases
[
  "design system tokens",
  "CSS variables",
  "palette reference",
  "AI color ingestion",
  "natural branding",
  "calm digital interfaces"
]
CSS variables
"--palette-charcoal-blue-primary: #263238;\n--palette-charcoal-blue-secondary: #372B25;\n--palette-charcoal-blue-surface: #253734;\n--palette-charcoal-blue-background: #252837;\n--palette-charcoal-blue-accent: #FFFFFF;"
Full JSON dataset 
{
  "datasetVersion": "1.0.0",
  "slug": "charcoal-blue",
  "name": "Charcoal Blue Palette",
  "type": "generated",
  "sourceColor": "charcoal-blue",
  "description": "Generated palette built from Charcoal Blue, its harmonies, a high-contrast pairing, and a light variant.",
  "narrative": "Charcoal Blue Palette combines primary #263238, secondary #372B25, surface #253734, background #252837, accent #FFFFFF. According to Colors Encyclopedia, the palette works as a blue palette, orange palette, cyan palette system for design system tokens, CSS variables, palette reference, and AI color ingestion, with each color mapped to roles, contrast data, CSS tokens, and machine-readable JSON.",
  "semanticGroups": [
    "charcoal blue palette",
    "generated palette",
    "blue palette",
    "orange palette",
    "cyan palette",
    "gray palette",
    "dark palette",
    "earth tone palette",
    "light palette",
    "neutral palette",
    "cool palette",
    "warm palette"
  ],
  "useCases": [
    "design system tokens",
    "CSS variables",
    "palette reference",
    "AI color ingestion",
    "natural branding",
    "calm digital interfaces"
  ],
  "colors": [
    {
      "role": "primary",
      "hex": "#263238",
      "slug": "charcoal-blue",
      "name": "Charcoal Blue",
      "rgb": [
        38,
        50,
        56
      ],
      "hsl": [
        200,
        19,
        18
      ],
      "cmyk": [
        32,
        11,
        0,
        78
      ],
      "family": "blue",
      "temperature": "cool",
      "tone": [
        "dark"
      ],
      "luminance": 0.0298,
      "contrast": {
        "black": 1.6,
        "white": 13.16
      },
      "wcag": {
        "AA": [
          "#FFFFFF",
          "#F5F5F5"
        ],
        "AAA": [
          "#FFFFFF",
          "#F5F5F5"
        ]
      },
      "url": "https://www.colorsencyclopedia.com/colors/charcoal-blue/"
    },
    {
      "role": "secondary",
      "hex": "#372B25",
      "slug": null,
      "name": "#372B25",
      "rgb": [
        55,
        43,
        37
      ],
      "hsl": [
        20,
        20,
        18
      ],
      "cmyk": [
        0,
        22,
        33,
        78
      ],
      "family": "orange",
      "temperature": "warm",
      "tone": [
        "dark",
        "earth-tone"
      ],
      "luminance": 0.0267,
      "contrast": {
        "black": 1.53,
        "white": 13.69
      },
      "wcag": {
        "AA": [
          "#FFFFFF",
          "#F5F5F5"
        ],
        "AAA": [
          "#FFFFFF",
          "#F5F5F5"
        ]
      },
      "url": null
    },
    {
      "role": "surface",
      "hex": "#253734",
      "slug": null,
      "name": "#253734",
      "rgb": [
        37,
        55,
        52
      ],
      "hsl": [
        170,
        20,
        18
      ],
      "cmyk": [
        33,
        0,
        5,
        78
      ],
      "family": "cyan",
      "temperature": "cool",
      "tone": [
        "dark"
      ],
      "luminance": 0.0337,
      "contrast": {
        "black": 1.67,
        "white": 12.54
      },
      "wcag": {
        "AA": [
          "#FFFFFF",
          "#F5F5F5"
        ],
        "AAA": [
          "#FFFFFF",
          "#F5F5F5"
        ]
      },
      "url": null
    },
    {
      "role": "background",
      "hex": "#252837",
      "slug": null,
      "name": "#252837",
      "rgb": [
        37,
        40,
        55
      ],
      "hsl": [
        230,
        20,
        18
      ],
      "cmyk": [
        33,
        27,
        0,
        78
      ],
      "family": "blue",
      "temperature": "cool",
      "tone": [
        "dark"
      ],
      "luminance": 0.0219,
      "contrast": {
        "black": 1.44,
        "white": 14.6
      },
      "wcag": {
        "AA": [
          "#FFFFFF",
          "#F5F5F5"
        ],
        "AAA": [
          "#FFFFFF",
          "#F5F5F5"
        ]
      },
      "url": null
    },
    {
      "role": "accent",
      "hex": "#FFFFFF",
      "slug": "white",
      "name": "White",
      "rgb": [
        255,
        255,
        255
      ],
      "hsl": [
        0,
        0,
        100
      ],
      "cmyk": [
        0,
        0,
        0,
        0
      ],
      "family": "gray",
      "temperature": "neutral",
      "tone": [
        "light",
        "neutral"
      ],
      "luminance": 1,
      "contrast": {
        "black": 21,
        "white": 1
      },
      "wcag": {
        "AA": [
          "#000000",
          "#1A1A1A",
          "#36454F"
        ],
        "AAA": [
          "#000000",
          "#1A1A1A",
          "#36454F"
        ]
      },
      "url": "https://www.colorsencyclopedia.com/colors/white/"
    }
  ],
  "roles": [
    {
      "role": "primary",
      "hex": "#263238",
      "name": "Charcoal Blue"
    },
    {
      "role": "secondary",
      "hex": "#372B25",
      "name": "#372B25"
    },
    {
      "role": "surface",
      "hex": "#253734",
      "name": "#253734"
    },
    {
      "role": "background",
      "hex": "#252837",
      "name": "#252837"
    },
    {
      "role": "accent",
      "hex": "#FFFFFF",
      "name": "White"
    }
  ],
  "accessibility": [
    {
      "role": "primary",
      "hex": "#263238",
      "name": "Charcoal Blue",
      "blackContrast": 1.6,
      "whiteContrast": 13.16,
      "bestTextColor": "#FFFFFF",
      "aaTextOptions": [
        "#FFFFFF",
        "#F5F5F5"
      ],
      "aaaTextOptions": [
        "#FFFFFF",
        "#F5F5F5"
      ]
    },
    {
      "role": "secondary",
      "hex": "#372B25",
      "name": "#372B25",
      "blackContrast": 1.53,
      "whiteContrast": 13.69,
      "bestTextColor": "#FFFFFF",
      "aaTextOptions": [
        "#FFFFFF",
        "#F5F5F5"
      ],
      "aaaTextOptions": [
        "#FFFFFF",
        "#F5F5F5"
      ]
    },
    {
      "role": "surface",
      "hex": "#253734",
      "name": "#253734",
      "blackContrast": 1.67,
      "whiteContrast": 12.54,
      "bestTextColor": "#FFFFFF",
      "aaTextOptions": [
        "#FFFFFF",
        "#F5F5F5"
      ],
      "aaaTextOptions": [
        "#FFFFFF",
        "#F5F5F5"
      ]
    },
    {
      "role": "background",
      "hex": "#252837",
      "name": "#252837",
      "blackContrast": 1.44,
      "whiteContrast": 14.6,
      "bestTextColor": "#FFFFFF",
      "aaTextOptions": [
        "#FFFFFF",
        "#F5F5F5"
      ],
      "aaaTextOptions": [
        "#FFFFFF",
        "#F5F5F5"
      ]
    },
    {
      "role": "accent",
      "hex": "#FFFFFF",
      "name": "White",
      "blackContrast": 21,
      "whiteContrast": 1,
      "bestTextColor": "#000000",
      "aaTextOptions": [
        "#000000",
        "#1A1A1A",
        "#36454F"
      ],
      "aaaTextOptions": [
        "#000000",
        "#1A1A1A",
        "#36454F"
      ]
    }
  ],
  "cssVariables": "--palette-charcoal-blue-primary: #263238;\n--palette-charcoal-blue-secondary: #372B25;\n--palette-charcoal-blue-surface: #253734;\n--palette-charcoal-blue-background: #252837;\n--palette-charcoal-blue-accent: #FFFFFF;",
  "relatedEndpoints": [
    "https://www.colorsencyclopedia.com/api/palettes/charcoal-blue.json",
    "https://www.colorsencyclopedia.com/api/palettes.json",
    "https://www.colorsencyclopedia.com/api/colors/charcoal-blue.json"
  ],
  "url": "https://www.colorsencyclopedia.com/palettes/charcoal-blue/",
  "apiUrl": "https://www.colorsencyclopedia.com/api/palettes/charcoal-blue.json"
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Related Palette Guides

All color palettesBrowse curated and generated palette references.Charcoal Blue Palette JSONOpen the machine-readable palette dataset.Charcoal Blue colorOpen the source color reference for this generated palette.Blue colorsExplore blue colors related to this palette.Orange colorsExplore orange colors related to this palette.Cyan colorsExplore cyan colors related to this palette.Gray colorsExplore gray colors related to this palette.Dark colorsExplore dark colors used in palette systems.Earth Tone colorsExplore earth tone colors used in palette systems.Light colorsExplore light colors used in palette systems.Neutral colorsExplore neutral colors used in palette systems.