#511B1B#511B1B

#511B1B is a dark, moderate red. Relative luminance 0.026; OKLCH L 30.6% C 0.081 H 23.2°. Best body text is #FFFFFF at 13.79:1 contrast (WCAG AA passes).

Color values

HEX	#511B1B
RGB	rgb(81, 27, 27)
HSL	hsl(0, 50%, 21%)
HSV	hsv(0, 67%, 32%)
CMYK	cmyk(0%, 66.7%, 66.7%, 68.2%)
CIE-LAB	lab(18.42, 25.31, 13.27)
CIE-LCH	lch(18.42, 28.58, 27.67°)
OKLab	oklab(30.65% 0.0748 0.032)
OKLCH	oklch(30.65% 0.081 23.2)
XYZ	xyz(3.9835, 2.6128, 1.3313)
Luminance	0.0261 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#511B1B #1B5151

analogous

#511B36 #511B1B #51361B

triadic

#511B1B #1B511B #1B1B51

tetradic

#511B1B #36511B #1B5151 #361B51

square

#511B1B #36511B #1B5151 #361B51

split-complementary

#511B1B #1B5136 #1B3651

monochromatic

#170808 #230C0C #511B1B #7F2A2A #AD3A3A

Accessibility & contrast

On white

13.79

#511B1B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.52

#511B1B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #511B1B

13.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##511B1B	#FFFFFF	#000000	##FFFFFF
##511B1B	1.00	13.79	1.52	13.79
#FFFFFF	13.79	1.00	21.00	1.00
#000000	1.52	21.00	1.00	21.00
##FFFFFF	13.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#29261B

Deuteranopia (green-blind)

#36311A

Tritanopia (blue-blind)

#59101C

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #511b1b;
/* rgb */ color: rgb(81, 27, 27);
/* oklch */ color: oklch(30.6% 0.081 23.2);

Tailwind

colors: {
  custom: {
    50: '#865a57',
    500: '#511b1b',
    950: '#000000',
  },
}

SCSS

$custom: #511b1b;
$custom-light: #865a57;
$custom-dark: #000000;

JSON

{
  "hex": "#511b1b",
  "rgb": {
    "r": 81,
    "g": 27,
    "b": 27
  },
  "hsl": {
    "h": 0,
    "s": 50,
    "l": 21.176
  },
  "oklch": {
    "l": 0.30647,
    "c": 0.08136,
    "h": 23.2
  },
  "luminance": 0.02612
}

Semantic roles & 50–950 ramp

primary

#511B1B

secondary

#418787

accent

#DADA4E

background

#F8F5F5

surface

#F0E9E9

border

#CBC5C5

text

#0C0403

muted

#7D7978

Preview Lab

Preview with #511B1B

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →