Colors Encyclopedia

HEX atlas value

#66591E

#66591E is a warm yellow HEX color close to Fern Frond. According to Colors Encyclopedia, it converts to RGB 102, 89, 30, HSL 49, 55%, 26%, has luminance 0.1006, and belongs to the earth tone group.

yellowwarmearth-tone
#66591E Sample readable text
HEX #66591E
RGB rgb(102, 89, 30)
HSL hsl(49 55% 26%)
CMYK cmyk(0, 13, 71, 60)
Luminance 0.1006
Contrast Black 3.01:1White 6.97:1

CSS

--color-66591e: #66591E;
.background-66591e { background-color: #66591E; }
.text-66591e { color: #66591E; }

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
Luminance0.1006
Black text3.01:1AA Fail
White text6.97:1AA 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":"#66591E","rgb":[102,89,30],"hsl":[49,55,26],"cmyk":[0,13,71,60],"luminance":0.1006,"contrast":{"black":3.01,"white":6.97}}
WCAG
{"AA":["#FFFFFF","#F5F5F5"],"AAA":[]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":3.01,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":6.97,"wcagAA":true,"wcagAAA":false}]
Accessible alternatives
[{"name":"#201C09","hex":"#201C09","family":"yellow","bestTextColor":"#FFFFFF","contrastBlack":1.23,"contrastWhite":17.05,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#1E2B67","hex":"#1E2B67","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.6,"contrastWhite":13.16,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#67351E","hex":"#67351E","family":"orange","bestTextColor":"#FFFFFF","contrastBlack":2.1,"contrastWhite":9.98,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Sepia","hex":"#704214","family":"orange","bestTextColor":"#FFFFFF","contrastBlack":2.48,"contrastWhite":8.47,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#58502C","hex":"#58502C","family":"yellow","bestTextColor":"#FFFFFF","contrastBlack":2.6,"contrastWhite":8.08,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]}]
AI context
{"semanticGroups":["warm yellow","earth tone","earth tone yellow","Fern Frond adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","natural palettes","highlight and warning systems"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/66591e.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/fern-frond.json","https://www.colorsencyclopedia.com/api/colors/sepia.json","https://www.colorsencyclopedia.com/api/colors/moss-deep.json"]}
Harmonies
{"complementary":"#1E2B67","analogous":["#67351E","#50671E"],"triadic":["#1E6759","#591E67"],"tetradic":["#1E6735","#1E2B67","#671E50"],"splitComplementary":["#1E5067","#351E67"],"monochromatic":["#AE9732","#66591E","#201C09"]}
Variants
{"light":"#AE9732","dark":"#201C09","saturated":"#75630F","desaturated":"#58502C","pastel":"#B4A250","neon":"#AD8E00"}
Nearest named colors
[{"slug":"fern-frond","name":"Fern Frond","hex":"#657220","distance":25.099800796022265},{"slug":"sepia","name":"Sepia","hex":"#704214","distance":27},{"slug":"moss-deep","name":"Moss Deep","hex":"#4A5D23","distance":28.722813232690143},{"slug":"coffee","name":"Coffee","hex":"#6F4E37","distance":28.75760768909681},{"slug":"dark-olive-green","name":"Dark Olive Green","hex":"#556B2F","distance":30.033314835362415}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #66591E

#66591E is classified as a warm yellow value with earth tone visual character. #66591E is visually closest to Fern Frond, a named green color with HEX #657220.

The RGB channels are 102, 89, and 30, with red carrying the strongest channel weight. In HSL, the hue is 49deg with 55% saturation and 26% lightness, so this page treats it as a moderate-saturation, dark 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 natural palettes. Its luminance is 0.1006, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 25.10, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text3.01:1AA Fail
White text6.97:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #66591E needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000003.01:1 · Fail
White text#FFFFFF6.97:1 · AA

Accessible Alternatives

#201C09#FFFFFF text · best 17.05:1#201C09
#1E2B67#FFFFFF text · best 13.16:1#1E2B67
#67351E#FFFFFF text · best 9.98:1#67351E
Sepia#FFFFFF text · best 8.47:1#704214
#58502C#FFFFFF text · best 8.08:1#58502C

Generated Palette

#66591E#66591E
#1E2B67#1E2B67
#67351E#67351E
#50671E#50671E
#AE9732#AE9732
#201C09#201C09

Color Harmonies

#1E2B67#1E2B67
#67351E#67351E
#50671E#50671E
#1E6759#1E6759
#591E67#591E67

Variants

#AE9732#AE9732
#201C09#201C09
#75630F#75630F
#58502C#58502C
#B4A250#B4A250
#AD8E00#AD8E00

Nearest Named Colors

Fern Frond#657220
Sepia#704214
Moss Deep#4A5D23
Coffee#6F4E37
Dark Olive Green#556B2F

Related HEX Guides

Fern Frond colorOpen the nearest named color reference for #657220.Sepia colorOpen the nearest named color reference for #704214.Moss Deep colorOpen the nearest named color reference for #4A5D23.Yellow color familyBrowse named yellow colors related to this HEX value.Warm colorsExplore colors with similar temperature behavior.Earth Tone colorsFind colors in the earth tone 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.#66591E APIOpen the machine-readable JSON record for this HEX value.