Colors Encyclopedia

HEX atlas value

#1B4128

#1B4128 is a cool green HEX color close to Charcoal Blue. According to Colors Encyclopedia, it converts to RGB 27, 65, 40, HSL 141, 41%, 18%, has luminance 0.0417, and belongs to the dark and earth tone groups.

greencooldarkearth-tone
#1B4128 Sample readable text
HEX #1B4128
RGB rgb(27, 65, 40)
HSL hsl(141 41% 18%)
CMYK cmyk(58, 0, 38, 75)
Luminance 0.0417
Contrast Black 1.83:1White 11.45:1

CSS

--color-1b4128: #1B4128;
.background-1b4128 { background-color: #1B4128; }
.text-1b4128 { color: #1B4128; }

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
Luminance0.0417
Black text1.83:1AA Fail
White text11.45:1AA 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":"#1B4128","rgb":[27,65,40],"hsl":[141,41,18],"cmyk":[58,0,38,75],"luminance":0.0417,"contrast":{"black":1.83,"white":11.45}}
WCAG
{"AA":["#FFFFFF","#F5F5F5"],"AAA":["#FFFFFF","#F5F5F5"]}
Safe pairings
[{"name":"Black text","hex":"#000000","contrast":1.83,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":11.45,"wcagAA":true,"wcagAAA":true}]
Accessible alternatives
[{"name":"Black","hex":"#000000","family":"gray","bestTextColor":"#FFFFFF","contrastBlack":1,"contrastWhite":21,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Slate Black","hex":"#26282A","family":"gray","bestTextColor":"#FFFFFF","contrastBlack":1.42,"contrastWhite":14.79,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#411B34","hex":"#411B34","family":"pink","bestTextColor":"#FFFFFF","contrastBlack":1.43,"contrastWhite":14.66,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Asphalt","hex":"#2B2B2B","family":"gray","bestTextColor":"#FFFFFF","contrastBlack":1.48,"contrastWhite":14.15,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Charcoal Blue","hex":"#263238","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.6,"contrastWhite":13.16,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]}]
AI context
{"semanticGroups":["cool green","dark","earth tone","dark green","earth tone green","Charcoal Blue adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","natural palettes","dark theme accents","botanical and wellness palettes"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/1b4128.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/charcoal-blue.json","https://www.colorsencyclopedia.com/api/colors/gunmetal.json","https://www.colorsencyclopedia.com/api/colors/british-racing-green.json"]}
Harmonies
{"complementary":"#411B34","analogous":["#21411B","#1B413B"],"triadic":["#281B41","#41281B"],"tetradic":["#1B2141","#411B34","#413B1B"],"splitComplementary":["#3B1B41","#411B21"],"monochromatic":["#368151","#1B4128","#000000"]}
Variants
{"light":"#368151","dark":"#000000","saturated":"#114B25","desaturated":"#25372B","pastel":"#518A65","neon":"#00852E"}
Nearest named colors
[{"slug":"charcoal-blue","name":"Charcoal Blue","hex":"#263238","distance":24.535688292770594},{"slug":"gunmetal","name":"Gunmetal","hex":"#2A3439","distance":26.13426869074396},{"slug":"british-racing-green","name":"British Racing Green","hex":"#004225","distance":27.184554438136374},{"slug":"asphalt","name":"Asphalt","hex":"#2B2B2B","distance":27.367864366808018},{"slug":"slate-black","name":"Slate Black","hex":"#26282A","distance":27.386127875258307}]
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

HEX meaning and use

About #1B4128

#1B4128 is classified as a cool green value with dark and earth tone visual character. #1B4128 is visually closest to Charcoal Blue, a named blue color with HEX #263238.

The RGB channels are 27, 65, and 40, with green carrying the strongest channel weight. In HSL, the hue is 141deg with 41% saturation and 18% 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 0.0417, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 24.54, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text1.83:1AA Fail
White text11.45:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: #FFFFFF, #F5F5F5.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #1B4128 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000001.83:1 · Fail
White text#FFFFFF11.45:1 · AAA

Accessible Alternatives

Black#FFFFFF text · best 21:1#000000
Slate Black#FFFFFF text · best 14.79:1#26282A
#411B34#FFFFFF text · best 14.66:1#411B34
Asphalt#FFFFFF text · best 14.15:1#2B2B2B
Charcoal Blue#FFFFFF text · best 13.16:1#263238

Generated Palette

#1B4128#1B4128
#411B34#411B34
#21411B#21411B
#1B413B#1B413B
#368151#368151
Black#000000

Color Harmonies

#411B34#411B34
#21411B#21411B
#1B413B#1B413B
#281B41#281B41
#41281B#41281B

Variants

#368151#368151
Black#000000
#114B25#114B25
#25372B#25372B
#518A65#518A65
#00852E#00852E

Nearest Named Colors

Charcoal Blue#263238
Gunmetal#2A3439
British Racing Green#004225
Asphalt#2B2B2B
Slate Black#26282A

Related HEX Guides

Charcoal Blue colorOpen the nearest named color reference for #263238.Gunmetal colorOpen the nearest named color reference for #2A3439.British Racing Green colorOpen the nearest named color reference for #004225.Green color familyBrowse named green colors related to this HEX value.Cool colorsExplore colors with similar temperature behavior.Dark colorsFind colors in the dark group.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.#1B4128 APIOpen the machine-readable JSON record for this HEX value.