Colors Encyclopedia

Named color

Ultramarine

Ultramarine is a jewel tone blue color with HEX #120A8F. According to Colors Encyclopedia, it has RGB 18, 10, 143, HSL 244, 87%, 30%, cool temperature, and is useful for historical references, pigment palettes, and cultural color systems.

#120A8F blue cool jewel-tone
HEX #120A8F
RGB rgb(18, 10, 143)
HSL hsl(244 87% 30%)
CMYK cmyk(87, 93, 0, 44)
Luminance 0.0233
Contrast Black 1.47:1White 14.32:1

CSS Utilities

--color-ultramarine: #120A8F;
.bg-ultramarine { background-color: #120A8F; }
.text-ultramarine { color: #120A8F; }
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
Luminance0.0233
Black text1.47:1AA Fail
White text14.32:1AA 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": "#120A8F",
  "rgb": [
    18,
    10,
    143
  ],
  "hsl": [
    244,
    87,
    30
  ],
  "cmyk": [
    87,
    93,
    0,
    44
  ],
  "luminance": 0.0233,
  "contrast": {
    "black": 1.47,
    "white": 14.32
  }
}
WCAG
{
  "AA": [
    "#FFFFFF",
    "#F5F5F5"
  ],
  "AAA": [
    "#FFFFFF",
    "#F5F5F5"
  ]
}
Harmonies
{
  "complementary": "#868F0A",
  "analogous": [
    "#0A448F",
    "#550A8F"
  ],
  "triadic": [
    "#8F130A",
    "#0A8F13"
  ],
  "tetradic": [
    "#8F0A44",
    "#868F0A",
    "#0A8F55"
  ],
  "splitComplementary": [
    "#8F550A",
    "#448F0A"
  ],
  "monochromatic": [
    "#1E10E5",
    "#120A8F",
    "#080439"
  ]
}
Variants
{
  "light": "#1E10E5",
  "dark": "#080439",
  "saturated": "#0A0099",
  "desaturated": "#211B7E",
  "pastel": "#453ADF",
  "neon": "#0D00C2"
}
Pairings
{
  "best": [
    "#FFFFFF",
    "#868F0A",
    "#0A448F",
    "#550A8F"
  ],
  "avoid": [
    "#211B7E",
    "#1E10E5"
  ],
  "neutral": [
    "#1A1A1A",
    "#F5F5F5",
    "#E8E8E4"
  ],
  "highContrast": [
    "#FFFFFF"
  ],
  "lowContrast": [
    "#1E10E5",
    "#211B7E"
  ]
}
Knowledge graph
{
  "nearestColors": [
    "dark-blue",
    "navy",
    "navy-blue",
    "zaffre",
    "midnight-blue"
  ],
  "generatedPalettes": [
    "ultramarine"
  ],
  "generatedComparisons": [
    "midnight-blue-vs-ultramarine",
    "ultramarine-vs-dark-blue",
    "ultramarine-vs-navy",
    "zaffre-vs-ultramarine"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/ultramarine",
    "/wcag/ultramarine",
    "/css/colors/ultramarine",
    "/hex/120a8f"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/ultramarine"
    ],
    "related": [
      "/colors/dark-blue",
      "/colors/navy",
      "/colors/navy-blue",
      "/colors/zaffre",
      "/colors/midnight-blue",
      "/compare/midnight-blue-vs-ultramarine",
      "/compare/ultramarine-vs-dark-blue",
      "/compare/ultramarine-vs-navy",
      "/compare/zaffre-vs-ultramarine",
      "/harmonies/ultramarine",
      "/wcag/ultramarine",
      "/css/colors/ultramarine",
      "/hex/120a8f"
    ]
  }
}
Full JSON dataset 
{
  "slug": "ultramarine",
  "name": "Ultramarine",
  "hex": "#120A8F",
  "uses": [
    "historical references",
    "pigment palettes",
    "cultural color systems"
  ],
  "psychology": {
    "associations": [
      "heritage",
      "craft",
      "specificity"
    ],
    "contexts": [
      "museum design",
      "education",
      "editorial research",
      "cultural references"
    ],
    "avoidIn": [
      "generic unlabeled palette systems"
    ]
  },
  "aliases": [],
  "sourceType": "curated",
  "confidence": "medium",
  "reviewStatus": "manual",
  "sourceUrl": "https://www.colorsencyclopedia.com/assets/colors.json",
  "origin": {
    "type": "common",
    "notes": "Curated common color reference used in design, material, cultural, and editorial color systems."
  },
  "family": "blue",
  "temperature": "cool",
  "tone": [
    "jewel-tone"
  ],
  "editorialNotes": "Curated internal color record with computed technical properties.",
  "tags": [
    "blue",
    "cool",
    "jewel-tone",
    "historical-references",
    "pigment-palettes",
    "cultural-color-systems",
    "heritage",
    "craft",
    "specificity"
  ],
  "popularity": 84,
  "rgb": [
    18,
    10,
    143
  ],
  "hsl": [
    244,
    87,
    30
  ],
  "cmyk": [
    87,
    93,
    0,
    44
  ],
  "luminance": 0.0233,
  "contrast": {
    "black": 1.47,
    "white": 14.32
  },
  "harmonies": {
    "complementary": "#868F0A",
    "analogous": [
      "#0A448F",
      "#550A8F"
    ],
    "triadic": [
      "#8F130A",
      "#0A8F13"
    ],
    "tetradic": [
      "#8F0A44",
      "#868F0A",
      "#0A8F55"
    ],
    "splitComplementary": [
      "#8F550A",
      "#448F0A"
    ],
    "monochromatic": [
      "#1E10E5",
      "#120A8F",
      "#080439"
    ]
  },
  "variants": {
    "light": "#1E10E5",
    "dark": "#080439",
    "saturated": "#0A0099",
    "desaturated": "#211B7E",
    "pastel": "#453ADF",
    "neon": "#0D00C2"
  },
  "wcag": {
    "AA": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "AAA": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  "css": {
    "variable": "--color-ultramarine: #120A8F;",
    "utility": ".bg-ultramarine { background-color: #120A8F; }",
    "textUtility": ".text-ultramarine { color: #120A8F; }"
  },
  "nearestColors": [
    "dark-blue",
    "navy",
    "navy-blue",
    "zaffre",
    "midnight-blue"
  ],
  "generatedPalettes": [
    "ultramarine"
  ],
  "generatedComparisons": [
    "midnight-blue-vs-ultramarine",
    "ultramarine-vs-dark-blue",
    "ultramarine-vs-navy",
    "zaffre-vs-ultramarine"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/ultramarine",
    "/wcag/ultramarine",
    "/css/colors/ultramarine",
    "/hex/120a8f"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/ultramarine"
    ],
    "related": [
      "/colors/dark-blue",
      "/colors/navy",
      "/colors/navy-blue",
      "/colors/zaffre",
      "/colors/midnight-blue",
      "/compare/midnight-blue-vs-ultramarine",
      "/compare/ultramarine-vs-dark-blue",
      "/compare/ultramarine-vs-navy",
      "/compare/zaffre-vs-ultramarine",
      "/harmonies/ultramarine",
      "/wcag/ultramarine",
      "/css/colors/ultramarine",
      "/hex/120a8f"
    ]
  },
  "pairings": {
    "best": [
      "#FFFFFF",
      "#868F0A",
      "#0A448F",
      "#550A8F"
    ],
    "avoid": [
      "#211B7E",
      "#1E10E5"
    ],
    "neutral": [
      "#1A1A1A",
      "#F5F5F5",
      "#E8E8E4"
    ],
    "highContrast": [
      "#FFFFFF"
    ],
    "lowContrast": [
      "#1E10E5",
      "#211B7E"
    ]
  }
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Color meaning and use

About Ultramarine Color

Ultramarine sits in the blue family with cool temperature and jewel tone visual character. Ultramarine is a commonly used color name in design references, palettes, and editorial color systems.

Its common associations include heritage, craft, and specificity, which makes it relevant for museum design and education. In design work, Ultramarine is most useful for historical references, pigment palettes, and cultural color systems, especially when paired with white text for stronger contrast.

Related Color Guides

Blue color familyBrowse named blue colors and compare nearby swatches.Cool colorsExplore colors with cool temperature behavior.Jewel Tone colorsFind colors with jewel tone visual character.Ultramarine accessibilityCheck contrast and WCAG text options for #120A8F.Ultramarine CSS utilitiesUse Ultramarine in CSS variables and utility classes.#120A8F HEX atlasOpen the permanent HEX atlas record for conversions and variants.Ultramarine paletteOpen the generated palette based on Ultramarine.Ultramarine harmoniesExplore complementary, analogous, triadic, and tetradic harmonies.

WCAG Accessibility

Contrast checks for Ultramarine against black and white text.

Black text1.47:1AA Fail
White text14.32:1AA Pass
AA text options#FFFFFF, #F5F5F5
AAA text options#FFFFFF, #F5F5F5
Open WCAG pageDetailed contrast notes, warnings, alternatives, and UI examples

Similar Colors

Dark Blue#00008B
Navy#000080
Navy Blue#000080
Zaffre#0014A8
Midnight Blue#191970

Color Harmonies

#868F0A#868F0A
#0A448F#0A448F
#550A8F#550A8F
#8F130A#8F130A
#0A8F13#0A8F13
Open full Ultramarine harmony pageComplementary, analogous, triadic, tetradic, split, and monochromatic sets

Variants

#1E10E5#1E10E5
#080439#080439
#0A0099#0A0099
#211B7E#211B7E
#453ADF#453ADF
#0D00C2#0D00C2

Pairings

White#FFFFFF
#868F0A#868F0A
#0A448F#0A448F
#550A8F#550A8F
Matte Black#1A1A1A
White Smoke#F5F5F5