Colors Encyclopedia

HEX atlas value

#E31F1C

#E31F1C is a warm red HEX color close to Cadmium Red. According to Colors Encyclopedia, it converts to RGB 227, 31, 28, HSL 1, 78%, 50%, has luminance 0.1739, and belongs to the vibrant group.

redwarmvibrant
#E31F1C Sample readable text
HEX #E31F1C
RGB rgb(227, 31, 28)
HSL hsl(1 78% 50%)
CMYK cmyk(0, 86, 88, 11)
Luminance 0.1739
Contrast Black 4.48:1White 4.69:1

CSS

--color-e31f1c: #E31F1C;
.background-e31f1c { background-color: #E31F1C; }
.text-e31f1c { color: #E31F1C; }

Machine-readable data

Machine-Readable HEX Data (JSON)

Structured HEX color data for conversion, WCAG checks, CSS generation, automation, and AI ingestion.

AI-Ready Dataset v1.0.0
Luminance0.1739
Black text4.48:1AA Fail
White text4.69:1AA 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":"#E31F1C","rgb":[227,31,28],"hsl":[1,78,50],"cmyk":[0,86,88,11],"luminance":0.1739,"contrast":{"black":4.48,"white":4.69}}
WCAG
{"AA":["#FFFFFF"],"AAA":[]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":4.48,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":4.69,"wcagAA":true,"wcagAAA":false}]
Accessible alternatives
[{"name":"#1CE0E3","hex":"#1CE0E3","family":"cyan","bestTextColor":"#000000","contrastBlack":12.82,"contrastWhite":1.64,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#911412","hex":"#911412","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.31,"contrastWhite":9.08,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#E3831C","hex":"#E3831C","family":"orange","bestTextColor":"#000000","contrastBlack":7.53,"contrastWhite":2.79,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"#ED706E","hex":"#ED706E","family":"red","bestTextColor":"#000000","contrastBlack":7.14,"contrastWhite":2.94,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"Venetian Red","hex":"#C80815","family":"red","bestTextColor":"#FFFFFF","contrastBlack":3.5,"contrastWhite":6,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":[]}]
AI context
{"semanticGroups":["warm red","vibrant","vibrant red","Cadmium Red adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-energy accents","high-attention visual states"],"contrastSafeWith":["#FFFFFF"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/e31f1c.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/cadmium-red.json","https://www.colorsencyclopedia.com/api/colors/crimson.json","https://www.colorsencyclopedia.com/api/colors/cherry-red.json"]}
Harmonies
{"complementary":"#1CE0E3","analogous":["#E31C7C","#E3831C"],"triadic":["#1CE31F","#1F1CE3"],"tetradic":["#7CE31C","#1CE0E3","#831CE3"],"splitComplementary":["#1CE383","#1C7CE3"],"monochromatic":["#ED706E","#E31F1C","#911412"]}
Variants
{"light":"#ED706E","dark":"#911412","saturated":"#FF0400","desaturated":"#C73A38","pastel":"#E79897","neon":"#FF2C29"}
Nearest named colors
[{"slug":"cadmium-red","name":"Cadmium Red","hex":"#E30022","distance":31.575306807693888},{"slug":"crimson","name":"Crimson","hex":"#DC143C","distance":34.55430508634199},{"slug":"cherry-red","name":"Cherry Red","hex":"#D2042D","distance":36.15245496505044},{"slug":"venetian-red","name":"Venetian Red","hex":"#C80815","distance":36.15245496505044},{"slug":"poppy-red","name":"Poppy Red","hex":"#DC343B","distance":38.09199390948182}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #E31F1C

#E31F1C is classified as a warm red value with vibrant visual character. #E31F1C is visually closest to Cadmium Red, a named red color with HEX #E30022.

The RGB channels are 227, 31, and 28, with red carrying the strongest channel weight. In HSL, the hue is 1deg with 78% saturation and 50% lightness, so this page treats it as a high-saturation, mid-lightness atlas color rather than a generic swatch.

According to Colors Encyclopedia, this HEX value works best for color conversion, WCAG contrast checks, CSS color tokens, and high-energy accents. Its luminance is 0.1739, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 31.58, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text4.48:1AA Fail
White text4.69:1AA Pass

AA text options: #FFFFFF.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #E31F1C needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000004.48:1 · Fail
White text#FFFFFF4.69:1 · AA

Accessible Alternatives

#1CE0E3#000000 text · best 12.82:1#1CE0E3
#911412#FFFFFF text · best 9.08:1#911412
#E3831C#000000 text · best 7.53:1#E3831C
#ED706E#000000 text · best 7.14:1#ED706E
Venetian Red#FFFFFF text · best 6:1#C80815

Generated Palette

#E31F1C#E31F1C
#1CE0E3#1CE0E3
#E31C7C#E31C7C
#E3831C#E3831C
#ED706E#ED706E
#911412#911412

Color Harmonies

#1CE0E3#1CE0E3
#E31C7C#E31C7C
#E3831C#E3831C
#1CE31F#1CE31F
#1F1CE3#1F1CE3

Variants

#ED706E#ED706E
#911412#911412
#FF0400#FF0400
#C73A38#C73A38
#E79897#E79897
#FF2C29#FF2C29

Nearest Named Colors

Cadmium Red#E30022
Crimson#DC143C
Cherry Red#D2042D
Venetian Red#C80815
Poppy Red#DC343B

Related HEX Guides

Cadmium Red colorOpen the nearest named color reference for #E30022.Crimson colorOpen the nearest named color reference for #DC143C.Cherry Red colorOpen the nearest named color reference for #D2042D.Red color familyBrowse named red colors related to this HEX value.Warm colorsExplore colors with similar temperature behavior.Vibrant colorsFind colors in the vibrant group.Color palettesBrowse palette systems related to generated color combinations.Compare colorsCompare named colors near this HEX value.Accessible colorsBrowse WCAG-friendly named colors and safe text options.#E31F1C APIOpen the machine-readable JSON record for this HEX value.