HEX atlas value

#666709

#666709 is a warm yellow HEX color close to Fern Frond. According to Colors Encyclopedia, it converts to RGB 102, 103, 9, HSL 61, 84%, 22%, has luminance 0.1254, and belongs to the dark group.

yellow warm dark

#666709 Sample readable text

HEX #666709

RGB rgb(102, 103, 9)

HSL hsl(61 84% 22%)

CMYK cmyk(1, 0, 91, 60)

Luminance 0.1254

Contrast Black 3.51:1White 5.99:1

CSS

--color-666709: #666709;
.background-666709 { background-color: #666709; }
.text-666709 { color: #666709; }

Luminance0.1254

Black text3.51:1AA Fail

White text5.99:1AA 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":"#666709","rgb":[102,103,9],"hsl":[61,84,22],"cmyk":[1,0,91,60],"luminance":0.1254,"contrast":{"black":3.51,"white":5.99}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":3.51,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":5.99,"wcagAA":true,"wcagAAA":false}]

Accessible alternatives

[{"name":"#121302","hex":"#121302","family":"yellow","bestTextColor":"#FFFFFF","contrastBlack":1.12,"contrastWhite":18.75,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#0B0967","hex":"#0B0967","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.25,"contrastWhite":16.8,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#B9BC10","hex":"#B9BC10","family":"yellow","bestTextColor":"#000000","contrastBlack":10.26,"contrastWhite":2.05,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#673A09","hex":"#673A09","family":"orange","bestTextColor":"#FFFFFF","contrastBlack":2.19,"contrastWhite":9.61,"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"]}]

AI context

{"semanticGroups":["warm yellow","dark","dark yellow","Fern Frond adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","dark theme accents","highlight and warning systems"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/666709.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/fern-frond.json","https://www.colorsencyclopedia.com/api/colors/avocado.json","https://www.colorsencyclopedia.com/api/colors/olive.json"]}

Harmonies

{"complementary":"#0B0967","analogous":["#673A09","#376709"],"triadic":["#096667","#670966"],"tetradic":["#09673A","#0B0967","#670937"],"splitComplementary":["#093767","#3A0967"],"monochromatic":["#B9BC10","#666709","#121302"]}

Variants

{"light":"#B9BC10","dark":"#121302","saturated":"#6E7000","desaturated":"#5A5B15","pastel":"#C8CB25","neon":"#969900"}

Nearest named colors

[{"slug":"fern-frond","name":"Fern Frond","hex":"#657220","distance":25.514701644346147},{"slug":"avocado","name":"Avocado","hex":"#568203","distance":31.953090617340916},{"slug":"olive","name":"Olive","hex":"#808000","distance":37.17526059088221},{"slug":"moss-deep","name":"Moss Deep","hex":"#4A5D23","distance":39.496835316262995},{"slug":"sepia","name":"Sepia","hex":"#704214","distance":39.87480407475377}]

HEX meaning and use

About #666709

#666709 is classified as a warm yellow value with dark visual character. #666709 is visually closest to Fern Frond, a named green color with HEX #657220.

The RGB channels are 102, 103, and 9, with green carrying the strongest channel weight. In HSL, the hue is 61deg with 84% saturation and 22% lightness, so this page treats it as a high-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 dark theme accents. Its luminance is 0.1254, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 25.51, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text3.51:1AA Fail

White text5.99:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #666709 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000003.51:1 · Fail

White text#FFFFFF5.99:1 · AA

Accessible Alternatives

#121302#FFFFFF text · best 18.75:1#121302

#0B0967#FFFFFF text · best 16.8:1#0B0967

#B9BC10#000000 text · best 10.26:1#B9BC10

#673A09#FFFFFF text · best 9.61:1#673A09

Sepia#FFFFFF text · best 8.47:1#704214

Generated Palette

#666709#666709

#0B0967#0B0967

#673A09#673A09

#376709#376709

#B9BC10#B9BC10

#121302#121302

Color Harmonies

#0B0967#0B0967

#673A09#673A09

#376709#376709

#096667#096667

#670966#670966

Variants

#B9BC10#B9BC10

#121302#121302

#6E7000#6E7000

#5A5B15#5A5B15

#C8CB25#C8CB25

#969900#969900

Nearest Named Colors

Fern Frond#657220

Avocado#568203

Olive#808000

Moss Deep#4A5D23

Sepia#704214

#666709

CSS

Machine-Readable HEX Data (JSON)

About #666709

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides