Colors Encyclopedia

HEX atlas value

#CB280B

#CB280B is a warm red HEX color close to Mahogany. According to Colors Encyclopedia, it converts to RGB 203, 40, 11, HSL 9, 90%, 42%, has luminance 0.1424, and belongs to the vibrant group.

redwarmvibrant
#CB280B Sample readable text
HEX #CB280B
RGB rgb(203, 40, 11)
HSL hsl(9 90% 42%)
CMYK cmyk(0, 80, 95, 20)
Luminance 0.1424
Contrast Black 3.85:1White 5.46:1

CSS

--color-cb280b: #CB280B;
.background-cb280b { background-color: #CB280B; }
.text-cb280b { color: #CB280B; }

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
Luminance0.1424
Black text3.85:1AA Fail
White text5.46:1AA 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":"#CB280B","rgb":[203,40,11],"hsl":[9,90,42],"cmyk":[0,80,95,20],"luminance":0.1424,"contrast":{"black":3.85,"white":5.46}}
WCAG
{"AA":["#FFFFFF","#F5F5F5"],"AAA":[]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":3.85,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":5.46,"wcagAA":true,"wcagAAA":false}]
Accessible alternatives
[{"name":"#741706","hex":"#741706","family":"red","bestTextColor":"#FFFFFF","contrastBlack":1.87,"contrastWhite":11.24,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#0BAFCB","hex":"#0BAFCB","family":"cyan","bestTextColor":"#000000","contrastBlack":8.01,"contrastWhite":2.62,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"#CB880B","hex":"#CB880B","family":"orange","bestTextColor":"#000000","contrastBlack":7.07,"contrastWhite":2.97,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"Firebrick","hex":"#B22222","family":"red","bestTextColor":"#FFFFFF","contrastBlack":3.14,"contrastWhite":6.68,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":[]},{"name":"#F5593D","hex":"#F5593D","family":"red","bestTextColor":"#000000","contrastBlack":6.38,"contrastWhite":3.29,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":[]}]
AI context
{"semanticGroups":["warm red","vibrant","vibrant red","Mahogany 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/cb280b.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/mahogany.json","https://www.colorsencyclopedia.com/api/colors/rust.json","https://www.colorsencyclopedia.com/api/colors/venetian-red.json"]}
Harmonies
{"complementary":"#0BAFCB","analogous":["#CB0B4E","#CB880B"],"triadic":["#0BCB28","#280BCB"],"tetradic":["#4ECB0B","#0BAFCB","#880BCB"],"splitComplementary":["#0BCB88","#0B4ECB"],"monochromatic":["#F5593D","#CB280B","#741706"]}
Variants
{"light":"#F5593D","dark":"#741706","saturated":"#D62000","desaturated":"#B43822","pastel":"#EA7F6C","neon":"#FF2600"}
Nearest named colors
[{"slug":"mahogany","name":"Mahogany","hex":"#C04000","distance":28.600699292150182},{"slug":"rust","name":"Rust","hex":"#B7410E","distance":32.155870381627054},{"slug":"venetian-red","name":"Venetian Red","hex":"#C80815","distance":33.66006535941367},{"slug":"firebrick","name":"Firebrick","hex":"#B22222","distance":34.49637662132068},{"slug":"traffic-red","name":"Traffic Red","hex":"#CC0605","distance":34.539832078341085}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #CB280B

#CB280B is classified as a warm red value with vibrant visual character. #CB280B is visually closest to Mahogany, a named orange color with HEX #C04000.

The RGB channels are 203, 40, and 11, with red carrying the strongest channel weight. In HSL, the hue is 9deg with 90% saturation and 42% 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 0.1424, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 28.60, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text3.85:1AA Fail
White text5.46:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #CB280B needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000003.85:1 · Fail
White text#FFFFFF5.46:1 · AA

Accessible Alternatives

#741706#FFFFFF text · best 11.24:1#741706
#0BAFCB#000000 text · best 8.01:1#0BAFCB
#CB880B#000000 text · best 7.07:1#CB880B
Firebrick#FFFFFF text · best 6.68:1#B22222
#F5593D#000000 text · best 6.38:1#F5593D

Generated Palette

#CB280B#CB280B
#0BAFCB#0BAFCB
#CB0B4E#CB0B4E
#CB880B#CB880B
#F5593D#F5593D
#741706#741706

Color Harmonies

#0BAFCB#0BAFCB
#CB0B4E#CB0B4E
#CB880B#CB880B
#0BCB28#0BCB28
#280BCB#280BCB

Variants

#F5593D#F5593D
#741706#741706
#D62000#D62000
#B43822#B43822
#EA7F6C#EA7F6C
#FF2600#FF2600

Nearest Named Colors

Mahogany#C04000
Rust#B7410E
Venetian Red#C80815
Firebrick#B22222
Traffic Red#CC0605

Related HEX Guides

Mahogany colorOpen the nearest named color reference for #C04000.Rust colorOpen the nearest named color reference for #B7410E.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.#CB280B APIOpen the machine-readable JSON record for this HEX value.