Colors Encyclopedia

HEX atlas value

#A13B21

#A13B21 is a warm red HEX color close to Brown. According to Colors Encyclopedia, it converts to RGB 161, 59, 33, HSL 12, 66%, 38%, has luminance 0.1081, and belongs to the balanced group.

redwarmbalanced
#A13B21 Sample readable text
HEX #A13B21
RGB rgb(161, 59, 33)
HSL hsl(12 66% 38%)
CMYK cmyk(0, 63, 80, 37)
Luminance 0.1081
Contrast Black 3.16:1White 6.64:1

CSS

--color-a13b21: #A13B21;
.background-a13b21 { background-color: #A13B21; }
.text-a13b21 { color: #A13B21; }

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
Luminance0.1081
Black text3.16:1AA Fail
White text6.64:1AA 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":"#A13B21","rgb":[161,59,33],"hsl":[12,66,38],"cmyk":[0,63,80,37],"luminance":0.1081,"contrast":{"black":3.16,"white":6.64}}
WCAG
{"AA":["#FFFFFF","#F5F5F5"],"AAA":[]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":3.16,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":6.64,"wcagAA":true,"wcagAAA":false}]
Accessible alternatives
[{"name":"#551F11","hex":"#551F11","family":"red","bestTextColor":"#FFFFFF","contrastBlack":1.59,"contrastWhite":13.21,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Burnt Umber","hex":"#8A3324","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.58,"contrastWhite":8.14,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#A12147","hex":"#A12147","family":"pink","bestTextColor":"#FFFFFF","contrastBlack":2.82,"contrastWhite":7.44,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]},{"name":"Saddle Brown","hex":"#8B4513","family":"orange","bestTextColor":"#FFFFFF","contrastBlack":2.96,"contrastWhite":7.1,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]},{"name":"Brown","hex":"#A52A2A","family":"red","bestTextColor":"#FFFFFF","contrastBlack":2.96,"contrastWhite":7.09,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF"]}]
AI context
{"semanticGroups":["warm red","balanced","balanced red","Brown adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-attention visual states"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/a13b21.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/brown.json","https://www.colorsencyclopedia.com/api/colors/brick-red.json","https://www.colorsencyclopedia.com/api/colors/burnt-umber.json"]}
Harmonies
{"complementary":"#2187A1","analogous":["#A12147","#A17A21"],"triadic":["#21A13B","#3B21A1"],"tetradic":["#47A121","#2187A1","#7A21A1"],"splitComplementary":["#21A17A","#2147A1"],"monochromatic":["#D96245","#A13B21","#551F11"]}
Variants
{"light":"#D96245","dark":"#551F11","saturated":"#B62E0C","desaturated":"#8C4736","pastel":"#D18471","neon":"#EB2F00"}
Nearest named colors
[{"slug":"brown","name":"Brown","hex":"#A52A2A","distance":19.6468827043885},{"slug":"brick-red","name":"Brick Red","hex":"#8A3324","distance":24.535688292770594},{"slug":"burnt-umber","name":"Burnt Umber","hex":"#8A3324","distance":24.535688292770594},{"slug":"sienna","name":"Sienna","hex":"#A0522D","distance":25.96150997149434},{"slug":"saddle-brown","name":"Saddle Brown","hex":"#8B4513","distance":27.92848008753788}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #A13B21

#A13B21 is classified as a warm red value with balanced visual character. #A13B21 is visually closest to Brown, a named red color with HEX #A52A2A.

The RGB channels are 161, 59, and 33, with red carrying the strongest channel weight. In HSL, the hue is 12deg with 66% saturation and 38% 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 0.1081, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 19.65, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text3.16:1AA Fail
White text6.64:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #A13B21 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000003.16:1 · Fail
White text#FFFFFF6.64:1 · AA

Accessible Alternatives

#551F11#FFFFFF text · best 13.21:1#551F11
Burnt Umber#FFFFFF text · best 8.14:1#8A3324
#A12147#FFFFFF text · best 7.44:1#A12147
Saddle Brown#FFFFFF text · best 7.1:1#8B4513
Brown#FFFFFF text · best 7.09:1#A52A2A

Generated Palette

#A13B21#A13B21
#2187A1#2187A1
#A12147#A12147
#A17A21#A17A21
#D96245#D96245
#551F11#551F11

Color Harmonies

#2187A1#2187A1
#A12147#A12147
#A17A21#A17A21
#21A13B#21A13B
#3B21A1#3B21A1

Variants

#D96245#D96245
#551F11#551F11
#B62E0C#B62E0C
#8C4736#8C4736
#D18471#D18471
#EB2F00#EB2F00

Nearest Named Colors

Brown#A52A2A
Brick Red#8A3324
Burnt Umber#8A3324
Sienna#A0522D
Saddle Brown#8B4513

Related HEX Guides

Brown colorOpen the nearest named color reference for #A52A2A.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.#A13B21 APIOpen the machine-readable JSON record for this HEX value.