Colors Encyclopedia

Named color

International Orange

International Orange color #FF4F00: RGB 255, 79, 0 and HSL 19°, 100%, 50%. Explore its warm orange profile, contrast, CSS, palettes and harmonies.

#FF4F00 orange warm vibrant
HEX #FF4F00
RGB rgb(255, 79, 0)
HSL hsl(19 100% 50%)
CMYK cmyk(0, 69, 100, 0)
Luminance 0.2685
Contrast Black 6.37:1White 3.3:1

Use this color

Create with International Orange

Open a professional color tool with #FF4F00 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 International Orange 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-international-orange: #FF4F00;
.bg-international-orange { background-color: #FF4F00; }
.text-international-orange { color: #FF4F00; }
Open CSS utility pageReusable variables, classes, examples, and implementation notes

Color history, meaning and use · Editorially reviewed

About International Orange Color

International Orange is a family of visibility-oriented oranges, not one universal formula. The Golden Gate Bridge uses its own deeper, redder version. Consulting architect Irving Morrow was inspired by the red-lead primer on the rising steel, then chose a developed orange that would remain prominent against cool water and sky while harmonizing with the warmer hills.

The bridge authority explicitly distinguishes Golden Gate Bridge International Orange from aerospace and other standards and publishes its own CMYK mixture and tolerance process. A digital swatch can communicate the high-visibility red-orange character, but cannot replace a project specification, coated sample, substrate test, or measured color tolerance. In interfaces, it is strongest as a sparing alert or focal accent with tested foreground contrast.

This HEX is a screen reference, not the Golden Gate Bridge paint formula, an aerospace standard, traffic-safety specification, or physical color match.

WCAG Accessibility

Contrast checks for International Orange against black and white text.

Black text6.37:1AA Pass
White text3.3:1AA Fail
AA text options#000000, #1A1A1A
AAA text optionsNone in seed set
Open WCAG pageDetailed contrast notes, warnings, alternatives, and UI examples

Downloadable color reference infographic

International Orange Color Reference Infographic

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

1200 × 800
International Orange color reference infographic showing #FF4F00, RGB and HSL values, a coordinated palette, and black and white text contrast.
International Orange color reference infographic generated from the verified Colors Encyclopedia dataset.
Download WebPDownload SVGOpen full size

Color Harmonies

#00AEFF#00AEFF#FF002F#FF002F#FFD000#FFD000#00FF51#00FF51#5100FF#5100FF
Open full International Orange harmony pageComplementary, analogous, triadic, tetradic, split, and monochromatic sets

Variants

#FF8F5C#FF8F5C#A33400#A33400#FF5100#FF5100#E35B1C#E35B1C#F5AB89#F5AB89#FF6D29#FF6D29

Pairings

Black#000000#00AEFF#00AEFF#FF002F#FF002F#FFD000#FFD000Matte 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
Luminance0.2685
Black text6.37:1AA Pass
White text3.3:1AA Fail
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": "#FF4F00",
  "rgb": [
    255,
    79,
    0
  ],
  "hsl": [
    19,
    100,
    50
  ],
  "cmyk": [
    0,
    69,
    100,
    0
  ],
  "luminance": 0.2685,
  "contrast": {
    "black": 6.37,
    "white": 3.3
  }
}
WCAG
{
  "AA": [
    "#000000",
    "#1A1A1A"
  ],
  "AAA": []
}
Harmonies
{
  "complementary": "#00AEFF",
  "analogous": [
    "#FF002F",
    "#FFD000"
  ],
  "triadic": [
    "#00FF51",
    "#5100FF"
  ],
  "tetradic": [
    "#2FFF00",
    "#00AEFF",
    "#D000FF"
  ],
  "splitComplementary": [
    "#00FFD0",
    "#002FFF"
  ],
  "monochromatic": [
    "#FF8F5C",
    "#FF4F00",
    "#A33400"
  ]
}
Variants
{
  "light": "#FF8F5C",
  "dark": "#A33400",
  "saturated": "#FF5100",
  "desaturated": "#E35B1C",
  "pastel": "#F5AB89",
  "neon": "#FF6D29"
}
Pairings
{
  "best": [
    "#000000",
    "#00AEFF",
    "#FF002F",
    "#FFD000"
  ],
  "avoid": [
    "#E35B1C",
    "#FF8F5C"
  ],
  "neutral": [
    "#1A1A1A",
    "#F5F5F5",
    "#E8E8E4"
  ],
  "highContrast": [
    "#000000"
  ],
  "lowContrast": [
    "#FF8F5C",
    "#E35B1C"
  ]
}
Knowledge graph
{
  "nearestColors": [
    "orange-red",
    "hazard-orange",
    "neon-orange",
    "fire-opal",
    "safety-orange"
  ],
  "generatedPalettes": [
    "international-orange"
  ],
  "generatedComparisons": [
    "international-orange-vs-hazard-orange",
    "international-orange-vs-orange-red"
  ],
  "relatedFamilies": [
    "/colors/by-family/orange",
    "/colors/by-temperature/warm",
    "/colors/by-tone/vibrant"
  ],
  "relatedTools": [
    "/harmonies/international-orange",
    "/wcag/international-orange",
    "/css/colors/international-orange",
    "/hex/ff4f00",
    "/tools/css-gradient-generator",
    "/tools/color-palette-generator",
    "/tools/css-color-mixer",
    "/tools/contrast-checker"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/orange",
      "/colors/by-temperature/warm",
      "/colors/by-tone/vibrant"
    ],
    "narrower": [
      "/palettes/international-orange"
    ],
    "related": [
      "/colors/orange-red",
      "/colors/hazard-orange",
      "/colors/neon-orange",
      "/colors/fire-opal",
      "/colors/safety-orange",
      "/compare/international-orange-vs-hazard-orange",
      "/compare/international-orange-vs-orange-red",
      "/harmonies/international-orange",
      "/wcag/international-orange",
      "/css/colors/international-orange",
      "/hex/ff4f00",
      "/tools/css-gradient-generator",
      "/tools/color-palette-generator",
      "/tools/css-color-mixer",
      "/tools/contrast-checker"
    ]
  }
}
Full JSON dataset 
{
  "slug": "international-orange",
  "name": "International Orange",
  "hex": "#FF4F00",
  "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": "orange",
  "temperature": "warm",
  "tone": [
    "vibrant"
  ],
  "editorialNotes": "Curated internal color record with computed technical properties.",
  "tags": [
    "orange",
    "warm",
    "vibrant",
    "historical-references",
    "pigment-palettes",
    "cultural-color-systems",
    "heritage",
    "craft",
    "specificity"
  ],
  "popularity": 84,
  "rgb": [
    255,
    79,
    0
  ],
  "hsl": [
    19,
    100,
    50
  ],
  "cmyk": [
    0,
    69,
    100,
    0
  ],
  "luminance": 0.2685,
  "contrast": {
    "black": 6.37,
    "white": 3.3
  },
  "harmonies": {
    "complementary": "#00AEFF",
    "analogous": [
      "#FF002F",
      "#FFD000"
    ],
    "triadic": [
      "#00FF51",
      "#5100FF"
    ],
    "tetradic": [
      "#2FFF00",
      "#00AEFF",
      "#D000FF"
    ],
    "splitComplementary": [
      "#00FFD0",
      "#002FFF"
    ],
    "monochromatic": [
      "#FF8F5C",
      "#FF4F00",
      "#A33400"
    ]
  },
  "variants": {
    "light": "#FF8F5C",
    "dark": "#A33400",
    "saturated": "#FF5100",
    "desaturated": "#E35B1C",
    "pastel": "#F5AB89",
    "neon": "#FF6D29"
  },
  "wcag": {
    "AA": [
      "#000000",
      "#1A1A1A"
    ],
    "AAA": []
  },
  "css": {
    "variable": "--color-international-orange: #FF4F00;",
    "utility": ".bg-international-orange { background-color: #FF4F00; }",
    "textUtility": ".text-international-orange { color: #FF4F00; }"
  },
  "nearestColors": [
    "orange-red",
    "hazard-orange",
    "neon-orange",
    "fire-opal",
    "safety-orange"
  ],
  "generatedPalettes": [
    "international-orange"
  ],
  "generatedComparisons": [
    "international-orange-vs-hazard-orange",
    "international-orange-vs-orange-red"
  ],
  "relatedFamilies": [
    "/colors/by-family/orange",
    "/colors/by-temperature/warm",
    "/colors/by-tone/vibrant"
  ],
  "relatedTools": [
    "/harmonies/international-orange",
    "/wcag/international-orange",
    "/css/colors/international-orange",
    "/hex/ff4f00",
    "/tools/css-gradient-generator",
    "/tools/color-palette-generator",
    "/tools/css-color-mixer",
    "/tools/contrast-checker"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/orange",
      "/colors/by-temperature/warm",
      "/colors/by-tone/vibrant"
    ],
    "narrower": [
      "/palettes/international-orange"
    ],
    "related": [
      "/colors/orange-red",
      "/colors/hazard-orange",
      "/colors/neon-orange",
      "/colors/fire-opal",
      "/colors/safety-orange",
      "/compare/international-orange-vs-hazard-orange",
      "/compare/international-orange-vs-orange-red",
      "/harmonies/international-orange",
      "/wcag/international-orange",
      "/css/colors/international-orange",
      "/hex/ff4f00",
      "/tools/css-gradient-generator",
      "/tools/color-palette-generator",
      "/tools/css-color-mixer",
      "/tools/contrast-checker"
    ]
  },
  "pairings": {
    "best": [
      "#000000",
      "#00AEFF",
      "#FF002F",
      "#FFD000"
    ],
    "avoid": [
      "#E35B1C",
      "#FF8F5C"
    ],
    "neutral": [
      "#1A1A1A",
      "#F5F5F5",
      "#E8E8E4"
    ],
    "highContrast": [
      "#000000"
    ],
    "lowContrast": [
      "#FF8F5C",
      "#E35B1C"
    ]
  }
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Similar Colors

Orange Red#FF4500
Hazard Orange#FF6700
Neon Orange#FF5F1F
Fire Opal#E95C20
Safety Orange#FF7900

Related Color Guides

Orange color familyBrowse named orange colors and compare nearby swatches.Warm colorsExplore colors with warm temperature behavior.Vibrant colorsFind colors with vibrant visual character.International Orange accessibilityCheck contrast and WCAG text options for #FF4F00.International Orange CSS utilitiesUse International Orange in CSS variables and utility classes.#FF4F00 HEX atlasOpen the permanent HEX atlas record for conversions and variants.International Orange paletteOpen the generated palette based on International Orange.International Orange harmoniesExplore complementary, analogous, triadic, and tetradic harmonies.