Underground
Also known as: Intrigue , Sausalito Ridge , Major Brown , Zinc Grey
Underground is a rich, muted brown that reads as earthy and grounded. It earns its place in autumn design and coffee and food branding. Reach for a blue companion shade to give Underground maximum contrast. On white it reads clearly at 6.67:1 contrast, safe for body text under WCAG AA.
Reference
Underground color codes
- HEX
- #665A51
- RGB
- rgb(102, 90, 81)
- RGBA
- rgba(102, 90, 81, 1)
- HSL
- hsl(26, 11%, 36%)
- HSV
- hsv(26, 21%, 40%)
- CMYK
- cmyk(0%, 12%, 21%, 60%)
- LAB
- lab(39.2 3.8 7.1)
- OKLCH
- oklch(47.6% 0.021 59.1)
Analysis
Color intelligence
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Gamut
The full range of colors a device or space can show. sRGB is the common screen gamut; Display P3 is wider. A color outside a gamut cannot be shown accurately there and must be mapped inward.Full glossary entry →Displays accurately on every screen and translates well to print.
Temperature
Undertone
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neutral, leaning warm
subtle orange undertone in this near-neutral
Nearest standard colors
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Delta E (ΔE)
A measure of how different two colors look. Below 1 the difference is invisible to almost everyone; below 2.3 most people can't tell them apart; above 10 they are clearly different colors. We use CIEDE2000, the modern standard.Full glossary entry →
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Delta E (ΔE)
A measure of how different two colors look. Below 1 the difference is invisible to almost everyone; below 2.3 most people can't tell them apart; above 10 they are clearly different colors. We use CIEDE2000, the modern standard.Full glossary entry →- CSS: dimgray #696969 · ΔE 8.6
- RAL 8025: Pale brown #755C49 · ΔE 6.4 · approximate
RAL values are widely published approximations of the physical standard. For Pantone-adjacent workflows, match by eye against a physical fan deck. Pantone's values are proprietary and device-dependent, so we don't print lookups.
Where Underground works
- Web & UI: Use it directly for text on light surfaces; it clears AA contrast without adjustment.
- Interiors: Use it where you want the eye to land: a front door, built-ins, or one bold wall.
- Fashion: Works as a base layer or outerwear tone that lets brighter pieces do the talking.
- Branding: As a brand anchor it reads established and tactile; pair with a single vivid accent for energy.
- Web & UI: Use it decoratively for dividers, chart series, and illustration accents, and let neutrals carry the type.
- Fashion: One garment in this color carries an outfit; two starts to compete.
Copy as: every ecosystem
Variations
Tints, shades, and tones of Underground
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Tint
A color mixed with white, which raises its lightness. Pink is a tint of red. Tints feel softer and more open than the base color.Full glossary entry →
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Tint
A color mixed with white, which raises its lightness. Pink is a tint of red. Tints feel softer and more open than the base color.Full glossary entry →Tints (lighter)
Shades (darker)
Harmonies
Color harmonies
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Complementary colors
Two colors opposite each other on the wheel. They create the strongest contrast and make each other look more intense, so they work best used unevenly.Full glossary entry →
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Complementary colors
Two colors opposite each other on the wheel. They create the strongest contrast and make each other look more intense, so they work best used unevenly.Full glossary entry →Palettes built from Underground by rotating its hue in OKLCH space. Click any swatch to copy its hex code.
Complementary
Analogous
Triadic
Split-complementary
Tetradic
Monochromatic
Accessibility
Contrast & accessibility
Aa on white
contrast 6.67:1
AA pass AAA fail AA large pass
Aa on black
contrast 3.15:1
AA fail AAA fail AA large pass
Best text color on a Underground background: #ffffff
Palettes
Palettes featuring Underground
Underground with its complement
Soft neighbors of Underground
Underground triad
Explore
Similar colors
- Metropolis #61584F · ΔE 1.9
- Kabul #6C5E53 · ΔE 1.9
- Bark #5F5854 · ΔE 3.3
- Caveman #625C58 · ΔE 3.5
- Smokescreen #5E5755 · ΔE 4.3
- Morel #73645C · ΔE 4.3
Looking for maximum contrast instead? The complement of Underground is closest to Lava Rock .
FAQ
Underground FAQs
What color is Underground?
Underground is a dark brown with the hex code #665A51. In HSL terms it has a hue of 26°, 11% saturation, and 36% lightness.
What is the hex code for Underground?
The hex code for Underground is #665A51. In RGB it's rgb(102, 90, 81), and in CMYK it's cmyk(0%, 12%, 21%, 60%).
What colors go well with Underground?
Underground pairs naturally with blue tones from its complementary harmony, and with cyan accents from its split-complementary palette. Its own tints and shades always work as a monochrome scheme.
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