Colors Encyclopedia

Named color

Ink Blue

Ink Blue is a dark and jewel tone blue color with HEX #003F5C. According to Colors Encyclopedia, it has RGB 0, 63, 92, HSL 199, 100%, 18%, cool temperature, and is useful for interfaces, brand systems, and technical design.

#003F5C blue cool darkjewel-tone
HEX #003F5C
RGB rgb(0, 63, 92)
HSL hsl(199 100% 18%)
CMYK cmyk(100, 32, 0, 64)
Luminance 0.0433
Contrast Black 1.87:1White 11.25:1

CSS Utilities

--color-ink-blue: #003F5C;
.bg-ink-blue { background-color: #003F5C; }
.text-ink-blue { color: #003F5C; }
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
Luminance0.0433
Black text1.87:1AA Fail
White text11.25:1AA 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": "#003F5C",
  "rgb": [
    0,
    63,
    92
  ],
  "hsl": [
    199,
    100,
    18
  ],
  "cmyk": [
    100,
    32,
    0,
    64
  ],
  "luminance": 0.0433,
  "contrast": {
    "black": 1.87,
    "white": 11.25
  }
}
WCAG
{
  "AA": [
    "#FFFFFF",
    "#F5F5F5"
  ],
  "AAA": [
    "#FFFFFF",
    "#F5F5F5"
  ]
}
Harmonies
{
  "complementary": "#5C1D00",
  "analogous": [
    "#005C4B",
    "#00115C"
  ],
  "triadic": [
    "#5C003F",
    "#3F5C00"
  ],
  "tetradic": [
    "#4B005C",
    "#5C1D00",
    "#115C00"
  ],
  "splitComplementary": [
    "#5C0011",
    "#5C4B00"
  ],
  "monochromatic": [
    "#007DB8",
    "#003F5C",
    "#000000"
  ]
}
Variants
{
  "light": "#007DB8",
  "dark": "#000000",
  "saturated": "#003F5C",
  "desaturated": "#0A3B52",
  "pastel": "#1090CB",
  "neon": "#005B85"
}
Pairings
{
  "best": [
    "#FFFFFF",
    "#5C1D00",
    "#005C4B",
    "#00115C"
  ],
  "avoid": [
    "#0A3B52",
    "#007DB8"
  ],
  "neutral": [
    "#1A1A1A",
    "#F5F5F5",
    "#E8E8E4"
  ],
  "highContrast": [
    "#FFFFFF"
  ],
  "lowContrast": [
    "#007DB8",
    "#0A3B52"
  ]
}
Knowledge graph
{
  "nearestColors": [
    "prussian-blue",
    "sapphire-deep",
    "peacock-blue",
    "petrol-blue",
    "bottle-green"
  ],
  "generatedPalettes": [
    "ink-blue"
  ],
  "generatedComparisons": [
    "ink-blue-vs-prussian-blue",
    "ink-blue-vs-sapphire-deep"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/dark",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/ink-blue",
    "/wcag/ink-blue",
    "/css/colors/ink-blue",
    "/hex/003f5c"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/dark",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/ink-blue"
    ],
    "related": [
      "/colors/prussian-blue",
      "/colors/sapphire-deep",
      "/colors/peacock-blue",
      "/colors/petrol-blue",
      "/colors/bottle-green",
      "/compare/ink-blue-vs-prussian-blue",
      "/compare/ink-blue-vs-sapphire-deep",
      "/harmonies/ink-blue",
      "/wcag/ink-blue",
      "/css/colors/ink-blue",
      "/hex/003f5c"
    ]
  }
}
Full JSON dataset 
{
  "slug": "ink-blue",
  "name": "Ink Blue",
  "hex": "#003F5C",
  "uses": [
    "interfaces",
    "brand systems",
    "technical design"
  ],
  "psychology": {
    "associations": [
      "trust",
      "clarity",
      "calm"
    ],
    "contexts": [
      "technology",
      "finance",
      "healthcare",
      "navigation"
    ],
    "avoidIn": [
      "high-warmth food palettes"
    ]
  },
  "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 and editorial color systems."
  },
  "family": "blue",
  "temperature": "cool",
  "tone": [
    "dark",
    "jewel-tone"
  ],
  "editorialNotes": "Curated internal color record with computed technical properties.",
  "tags": [
    "blue",
    "cool",
    "dark",
    "jewel-tone",
    "interfaces",
    "brand-systems",
    "technical-design",
    "trust",
    "clarity",
    "calm"
  ],
  "popularity": 84,
  "rgb": [
    0,
    63,
    92
  ],
  "hsl": [
    199,
    100,
    18
  ],
  "cmyk": [
    100,
    32,
    0,
    64
  ],
  "luminance": 0.0433,
  "contrast": {
    "black": 1.87,
    "white": 11.25
  },
  "harmonies": {
    "complementary": "#5C1D00",
    "analogous": [
      "#005C4B",
      "#00115C"
    ],
    "triadic": [
      "#5C003F",
      "#3F5C00"
    ],
    "tetradic": [
      "#4B005C",
      "#5C1D00",
      "#115C00"
    ],
    "splitComplementary": [
      "#5C0011",
      "#5C4B00"
    ],
    "monochromatic": [
      "#007DB8",
      "#003F5C",
      "#000000"
    ]
  },
  "variants": {
    "light": "#007DB8",
    "dark": "#000000",
    "saturated": "#003F5C",
    "desaturated": "#0A3B52",
    "pastel": "#1090CB",
    "neon": "#005B85"
  },
  "wcag": {
    "AA": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "AAA": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  "css": {
    "variable": "--color-ink-blue: #003F5C;",
    "utility": ".bg-ink-blue { background-color: #003F5C; }",
    "textUtility": ".text-ink-blue { color: #003F5C; }"
  },
  "nearestColors": [
    "prussian-blue",
    "sapphire-deep",
    "peacock-blue",
    "petrol-blue",
    "bottle-green"
  ],
  "generatedPalettes": [
    "ink-blue"
  ],
  "generatedComparisons": [
    "ink-blue-vs-prussian-blue",
    "ink-blue-vs-sapphire-deep"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/dark",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/ink-blue",
    "/wcag/ink-blue",
    "/css/colors/ink-blue",
    "/hex/003f5c"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/dark",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/ink-blue"
    ],
    "related": [
      "/colors/prussian-blue",
      "/colors/sapphire-deep",
      "/colors/peacock-blue",
      "/colors/petrol-blue",
      "/colors/bottle-green",
      "/compare/ink-blue-vs-prussian-blue",
      "/compare/ink-blue-vs-sapphire-deep",
      "/harmonies/ink-blue",
      "/wcag/ink-blue",
      "/css/colors/ink-blue",
      "/hex/003f5c"
    ]
  },
  "pairings": {
    "best": [
      "#FFFFFF",
      "#5C1D00",
      "#005C4B",
      "#00115C"
    ],
    "avoid": [
      "#0A3B52",
      "#007DB8"
    ],
    "neutral": [
      "#1A1A1A",
      "#F5F5F5",
      "#E8E8E4"
    ],
    "highContrast": [
      "#FFFFFF"
    ],
    "lowContrast": [
      "#007DB8",
      "#0A3B52"
    ]
  }
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Color meaning and use

About Ink Blue Color

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

Its common associations include trust, clarity, and calm, which makes it relevant for technology and finance. In design work, Ink Blue is most useful for interfaces, brand systems, and technical design, 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.Dark colorsFind colors with dark visual character.Jewel Tone colorsFind colors with jewel tone visual character.Ink Blue accessibilityCheck contrast and WCAG text options for #003F5C.Ink Blue CSS utilitiesUse Ink Blue in CSS variables and utility classes.#003F5C HEX atlasOpen the permanent HEX atlas record for conversions and variants.Ink Blue paletteOpen the generated palette based on Ink Blue.Ink Blue harmoniesExplore complementary, analogous, triadic, and tetradic harmonies.

WCAG Accessibility

Contrast checks for Ink Blue against black and white text.

Black text1.87:1AA Fail
White text11.25:1AA Pass
AA text options#FFFFFF, #F5F5F5
AAA text options#FFFFFF, #F5F5F5
Open WCAG pageDetailed contrast notes, warnings, alternatives, and UI examples

Similar Colors

Prussian Blue#003153
Sapphire Deep#082567
Peacock Blue#005F69
Petrol Blue#005F6A
Bottle Green#006A4E

Color Harmonies

#5C1D00#5C1D00
#005C4B#005C4B
#00115C#00115C
#5C003F#5C003F
#3F5C00#3F5C00
Open full Ink Blue harmony pageComplementary, analogous, triadic, tetradic, split, and monochromatic sets

Variants

#007DB8#007DB8
Black#000000
Ink Blue#003F5C
#0A3B52#0A3B52
#1090CB#1090CB
#005B85#005B85

Pairings

White#FFFFFF
#5C1D00#5C1D00
#005C4B#005C4B
#00115C#00115C
Matte Black#1A1A1A
White Smoke#F5F5F5