Colors Encyclopedia

Named color

Ink Blue

Ink Blue color #003F5C: RGB 0, 63, 92 and HSL 199°, 100%, 18%. Explore its cool blue profile, contrast, CSS, palettes and harmonies.

#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

Use this color

Create with Ink Blue

Open a professional color tool with #003F5C 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 Ink Blue 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-ink-blue: #003F5C;
.bg-ink-blue { background-color: #003F5C; }
.text-ink-blue { color: #003F5C; }
Open CSS utility pageReusable variables, classes, examples, and implementation notes

Color meaning and use

About Ink Blue Color

Ink Blue uses HEX #003F5C, RGB 0, 63, 92, and HSL 199°, 100%, 18%. The dataset classifies it in the blue family with cool temperature and dark and jewel tone visual character.

No separate named-color neighbor is recorded for this entry. Its relative luminance is 0.0433; black contrast is 1.87:1 and white contrast is 11.25:1, making white the stronger of those two standard foreground choices.

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

Downloadable color reference infographic

Ink Blue Color Reference Infographic

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

1200 × 800
Ink Blue color reference infographic showing #003F5C, RGB and HSL values, a coordinated palette, and black and white text contrast.
Ink Blue color reference infographic generated from the verified Colors Encyclopedia dataset.
Download WebPDownload SVGOpen full size

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#007DB8Black#000000Ink Blue#003F5C#0A3B52#0A3B52#1090CB#1090CB#005B85#005B85

Pairings

White#FFFFFF#5C1D00#5C1D00#005C4B#005C4B#00115C#00115CMatte 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
Luminance0.0433
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",
    "/tools/css-gradient-generator",
    "/tools/color-palette-generator",
    "/tools/css-color-mixer",
    "/tools/contrast-checker"
  ],
  "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",
      "/tools/css-gradient-generator",
      "/tools/color-palette-generator",
      "/tools/css-color-mixer",
      "/tools/contrast-checker"
    ]
  }
}
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",
    "/tools/css-gradient-generator",
    "/tools/color-palette-generator",
    "/tools/css-color-mixer",
    "/tools/contrast-checker"
  ],
  "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",
      "/tools/css-gradient-generator",
      "/tools/color-palette-generator",
      "/tools/css-color-mixer",
      "/tools/contrast-checker"
    ]
  },
  "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

Similar Colors

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

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.