HEX atlas value

#66581E

#66581E is a warm yellow HEX color close to Fern Frond. According to Colors Encyclopedia, it converts to RGB 102, 88, 30, HSL 48, 55%, 26%, has luminance 0.099, and belongs to the earth tone group.

yellow warm earth-tone

#66581E Sample readable text

HEX #66581E

RGB rgb(102, 88, 30)

HSL hsl(48 55% 26%)

CMYK cmyk(0, 14, 71, 60)

Luminance 0.099

Contrast Black 2.98:1White 7.05:1

CSS

--color-66581e: #66581E;
.background-66581e { background-color: #66581E; }
.text-66581e { color: #66581E; }

Luminance0.099

Black text2.98:1AA Fail

White text7.05:1AA 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

Structured sections

Color systems

{"hex":"#66581E","rgb":[102,88,30],"hsl":[48,55,26],"cmyk":[0,14,71,60],"luminance":0.099,"contrast":{"black":2.98,"white":7.05}}

WCAG

{"AA":["#FFFFFF","#F5F5F5"],"AAA":["#FFFFFF"]}

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":2.98,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":7.05,"wcagAA":true,"wcagAAA":true}]

Accessible alternatives

[{"name":"#201B09","hex":"#201B09","family":"yellow","bestTextColor":"#FFFFFF","contrastBlack":1.22,"contrastWhite":17.18,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#1E2C67","hex":"#1E2C67","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.61,"contrastWhite":13.03,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#67341E","hex":"#67341E","family":"orange","bestTextColor":"#FFFFFF","contrastBlack":2.09,"contrastWhite":10.07,"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":"#584F2C","hex":"#584F2C","family":"yellow","bestTextColor":"#FFFFFF","contrastBlack":2.57,"contrastWhite":8.17,"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/66581e.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/coffee.json"]}

Harmonies

{"complementary":"#1E2C67","analogous":["#67341E","#51671E"],"triadic":["#1E6758","#581E67"],"tetradic":["#1E6734","#1E2C67","#671E51"],"splitComplementary":["#1E5167","#341E67"],"monochromatic":["#AE9532","#66581E","#201B09"]}

Variants

{"light":"#AE9532","dark":"#201B09","saturated":"#75610F","desaturated":"#584F2C","pastel":"#B4A050","neon":"#AD8B00"}

Nearest named colors

[{"slug":"fern-frond","name":"Fern Frond","hex":"#657220","distance":26.095976701399778},{"slug":"sepia","name":"Sepia","hex":"#704214","distance":26.153393661244042},{"slug":"coffee","name":"Coffee","hex":"#6F4E37","distance":28.39013913315678},{"slug":"moss-deep","name":"Moss Deep","hex":"#4A5D23","distance":28.879058156387302},{"slug":"loam","name":"Loam","hex":"#6B4F3A","distance":29.832867780352597}]

HEX meaning and use

About #66581E

#66581E is classified as a warm yellow value with earth tone visual character. #66581E is visually closest to Fern Frond, a named green color with HEX #657220.

The RGB channels are 102, 88, and 30, with red carrying the strongest channel weight. In HSL, the hue is 48deg 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 0.099, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 26.10, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text2.98:1AA Fail

White text7.05:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: #FFFFFF.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #66581E needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000002.98:1 · Fail

White text#FFFFFF7.05:1 · AAA

Accessible Alternatives

#201B09#FFFFFF text · best 17.18:1#201B09

#1E2C67#FFFFFF text · best 13.03:1#1E2C67

#67341E#FFFFFF text · best 10.07:1#67341E

Sepia#FFFFFF text · best 8.47:1#704214

#584F2C#FFFFFF text · best 8.17:1#584F2C

Generated Palette

#66581E#66581E

#1E2C67#1E2C67

#67341E#67341E

#51671E#51671E

#AE9532#AE9532

#201B09#201B09

Color Harmonies

#1E2C67#1E2C67

#67341E#67341E

#51671E#51671E

#1E6758#1E6758

#581E67#581E67

Variants

#AE9532#AE9532

#201B09#201B09

#75610F#75610F

#584F2C#584F2C

#B4A050#B4A050

#AD8B00#AD8B00

Nearest Named Colors

Fern Frond#657220

Sepia#704214

Coffee#6F4E37

Moss Deep#4A5D23

Loam#6B4F3A

#66581E

CSS

Machine-Readable HEX Data (JSON)

About #66581E

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides