Colors Encyclopedia

HEX atlas value

#901D1D

#901D1D is a warm red HEX color close to Ruby Red. According to Colors Encyclopedia, it converts to RGB 144, 29, 29, HSL 0, 66%, 34%, has luminance 0.069, and belongs to the balanced group.

redwarmbalanced
#901D1D Sample readable text
HEX #901D1D
RGB rgb(144, 29, 29)
HSL hsl(0 66% 34%)
CMYK cmyk(0, 80, 80, 44)
Luminance 0.069
Contrast Black 2.38:1White 8.82:1

CSS

--color-901d1d: #901D1D;
.background-901d1d { background-color: #901D1D; }
.text-901d1d { color: #901D1D; }

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
Luminance0.069
Black text2.38:1AA Fail
White text8.82:1AA 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":"#901D1D","rgb":[144,29,29],"hsl":[0,66,34],"cmyk":[0,80,80,44],"luminance":0.069,"contrast":{"black":2.38,"white":8.82}}
WCAG
{"AA":["#FFFFFF","#F5F5F5"],"AAA":["#FFFFFF","#F5F5F5"]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":2.38,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":8.82,"wcagAA":true,"wcagAAA":true}]
Accessible alternatives
[{"name":"#440E0E","hex":"#440E0E","family":"red","bestTextColor":"#FFFFFF","contrastBlack":1.31,"contrastWhite":15.98,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Carmine","hex":"#960018","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.31,"contrastWhite":9.09,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#7D3131","hex":"#7D3131","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.36,"contrastWhite":8.91,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Ruby Red","hex":"#9B111E","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.49,"contrastWhite":8.43,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#901D57","hex":"#901D57","family":"pink","bestTextColor":"#FFFFFF","contrastBlack":2.5,"contrastWhite":8.4,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]}]
AI context
{"semanticGroups":["warm red","balanced","balanced red","Ruby Red adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-attention visual states"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/901d1d.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/ruby-red.json","https://www.colorsencyclopedia.com/api/colors/brick-red.json","https://www.colorsencyclopedia.com/api/colors/burnt-umber.json"]}
Harmonies
{"complementary":"#1D9090","analogous":["#901D57","#90571D"],"triadic":["#1D901D","#1D1D90"],"tetradic":["#57901D","#1D9090","#571D90"],"splitComplementary":["#1D9057","#1D5790"],"monochromatic":["#D53434","#901D1D","#440E0E"]}
Variants
{"light":"#D53434","dark":"#440E0E","saturated":"#A30A0A","desaturated":"#7D3131","pastel":"#CC6161","neon":"#D60000"}
Nearest named colors
[{"slug":"ruby-red","name":"Ruby Red","hex":"#9B111E","distance":16.30950643030009},{"slug":"brick-red","name":"Brick Red","hex":"#8A3324","distance":23.853720883753127},{"slug":"burnt-umber","name":"Burnt Umber","hex":"#8A3324","distance":23.853720883753127},{"slug":"brown","name":"Brown","hex":"#A52A2A","distance":27.910571473905726},{"slug":"carmine","name":"Carmine","hex":"#960018","distance":30.033314835362415}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #901D1D

#901D1D is classified as a warm red value with balanced visual character. #901D1D is visually closest to Ruby Red, a named red color with HEX #9B111E.

The RGB channels are 144, 29, and 29, with red carrying the strongest channel weight. In HSL, the hue is 0deg with 66% saturation and 34% lightness, so this page treats it as a moderate-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-attention visual states. Its luminance is 0.069, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 16.31, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text2.38:1AA Fail
White text8.82:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: #FFFFFF, #F5F5F5.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #901D1D needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000002.38:1 · Fail
White text#FFFFFF8.82:1 · AAA

Accessible Alternatives

#440E0E#FFFFFF text · best 15.98:1#440E0E
Carmine#FFFFFF text · best 9.09:1#960018
#7D3131#FFFFFF text · best 8.91:1#7D3131
Ruby Red#FFFFFF text · best 8.43:1#9B111E
#901D57#FFFFFF text · best 8.4:1#901D57

Generated Palette

#901D1D#901D1D
#1D9090#1D9090
#901D57#901D57
#90571D#90571D
#D53434#D53434
#440E0E#440E0E

Color Harmonies

#1D9090#1D9090
#901D57#901D57
#90571D#90571D
#1D901D#1D901D
#1D1D90#1D1D90

Variants

#D53434#D53434
#440E0E#440E0E
#A30A0A#A30A0A
#7D3131#7D3131
#CC6161#CC6161
#D60000#D60000

Nearest Named Colors

Ruby Red#9B111E
Brick Red#8A3324
Burnt Umber#8A3324
Brown#A52A2A
Carmine#960018

Related HEX Guides

Ruby Red colorOpen the nearest named color reference for #9B111E.Brick Red colorOpen the nearest named color reference for #8A3324.Burnt Umber colorOpen the nearest named color reference for #8A3324.Red color familyBrowse named red colors related to this HEX value.Warm colorsExplore colors with similar temperature behavior.Balanced colorsFind colors in the balanced 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.#901D1D APIOpen the machine-readable JSON record for this HEX value.