Colors Encyclopedia

HEX atlas value

#B81B0A

#B81B0A is a warm red HEX color close to Firebrick. According to Colors Encyclopedia, it converts to RGB 184, 27, 10, HSL 6, 90%, 38%, has luminance 0.11, and belongs to the vibrant group.

redwarmvibrant
#B81B0A Sample readable text
HEX #B81B0A
RGB rgb(184, 27, 10)
HSL hsl(6 90% 38%)
CMYK cmyk(0, 85, 95, 28)
Luminance 0.11
Contrast Black 3.2:1White 6.56:1

CSS

--color-b81b0a: #B81B0A;
.background-b81b0a { background-color: #B81B0A; }
.text-b81b0a { color: #B81B0A; }

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
Luminance0.11
Black text3.2:1AA Fail
White text6.56:1AA 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":"#B81B0A","rgb":[184,27,10],"hsl":[6,90,38],"cmyk":[0,85,95,28],"luminance":0.11,"contrast":{"black":3.2,"white":6.56}}
WCAG
{"AA":["#FFFFFF","#F5F5F5"],"AAA":[]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":3.2,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":6.56,"wcagAA":true,"wcagAAA":false}]
Accessible alternatives
[{"name":"#610E05","hex":"#610E05","family":"red","bestTextColor":"#FFFFFF","contrastBlack":1.57,"contrastWhite":13.34,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#0AA7B8","hex":"#0AA7B8","family":"cyan","bestTextColor":"#000000","contrastBlack":7.23,"contrastWhite":2.9,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"Pompeian Red","hex":"#A42A04","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.91,"contrastWhite":7.21,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]},{"name":"#A32C1F","hex":"#A32C1F","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.94,"contrastWhite":7.15,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]},{"name":"Tool Red","hex":"#B11226","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.98,"contrastWhite":7.04,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]}]
AI context
{"semanticGroups":["warm red","vibrant","vibrant red","Firebrick adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-energy accents","high-attention visual states"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/b81b0a.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/firebrick.json","https://www.colorsencyclopedia.com/api/colors/pompeian-red.json","https://www.colorsencyclopedia.com/api/colors/venetian-red.json"]}
Harmonies
{"complementary":"#0AA7B8","analogous":["#B80A4F","#B8720A"],"triadic":["#0AB81B","#1B0AB8"],"tetradic":["#4FB80A","#0AA7B8","#720AB8"],"splitComplementary":["#0AB872","#0A4FB8"],"monochromatic":["#F43E2A","#B81B0A","#610E05"]}
Variants
{"light":"#F43E2A","dark":"#610E05","saturated":"#C21300","desaturated":"#A32C1F","pastel":"#E7685A","neon":"#EB1700"}
Nearest named colors
[{"slug":"firebrick","name":"Firebrick","hex":"#B22222","distance":25.709920264364882},{"slug":"pompeian-red","name":"Pompeian Red","hex":"#A42A04","distance":25.709920264364882},{"slug":"venetian-red","name":"Venetian Red","hex":"#C80815","distance":27.16615541441225},{"slug":"traffic-red","name":"Traffic Red","hex":"#CC0605","distance":29.427877939124322},{"slug":"tool-red","name":"Tool Red","hex":"#B11226","distance":30.23243291566195}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #B81B0A

#B81B0A is classified as a warm red value with vibrant visual character. #B81B0A is visually closest to Firebrick, a named red color with HEX #B22222.

The RGB channels are 184, 27, and 10, with red carrying the strongest channel weight. In HSL, the hue is 6deg with 90% saturation and 38% 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 0.11, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 25.71, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text3.2:1AA Fail
White text6.56:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #B81B0A needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000003.2:1 · Fail
White text#FFFFFF6.56:1 · AA

Accessible Alternatives

#610E05#FFFFFF text · best 13.34:1#610E05
#0AA7B8#000000 text · best 7.23:1#0AA7B8
Pompeian Red#FFFFFF text · best 7.21:1#A42A04
#A32C1F#FFFFFF text · best 7.15:1#A32C1F
Tool Red#FFFFFF text · best 7.04:1#B11226

Generated Palette

#B81B0A#B81B0A
#0AA7B8#0AA7B8
#B80A4F#B80A4F
#B8720A#B8720A
#F43E2A#F43E2A
#610E05#610E05

Color Harmonies

#0AA7B8#0AA7B8
#B80A4F#B80A4F
#B8720A#B8720A
#0AB81B#0AB81B
#1B0AB8#1B0AB8

Variants

#F43E2A#F43E2A
#610E05#610E05
#C21300#C21300
#A32C1F#A32C1F
#E7685A#E7685A
#EB1700#EB1700

Nearest Named Colors

Firebrick#B22222
Pompeian Red#A42A04
Venetian Red#C80815
Traffic Red#CC0605
Tool Red#B11226

Related HEX Guides

Firebrick colorOpen the nearest named color reference for #B22222.Pompeian Red colorOpen the nearest named color reference for #A42A04.Venetian Red colorOpen the nearest named color reference for #C80815.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.#B81B0A APIOpen the machine-readable JSON record for this HEX value.