Underground
Also known as: Intrigue, Sausalito Ridge, Major Brown, Zinc Grey
Part of the brown family, Underground pairs a rich base with a earthy and grounded presence — ideal for 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.
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)
Color intelligence
Displays accurately on every screen and translates well to print.
Temperature
neutral, leaning warm
subtle orange undertone in this near-neutral
Nearest standard colors
- 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 — 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 — dividers, chart series, 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
Tints, shades, and tones of Underground
Tints (lighter)
Shades (darker)
Color harmonies
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
Contrast & accessibility
Aa — on white
contrast 6.67:1
AA passAAA failAA large pass
Aa — on black
contrast 3.15:1
AA failAAA failAA large pass
Best text color on a Underground background: #ffffff
Palettes featuring Underground
Underground with its complement
Soft neighbors of Underground
Underground triad
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.
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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