#5B181B#5B181B

#5B181B is a dark, moderate red. Relative luminance 0.030; OKLCH L 32.1% C 0.098 H 22.1°. Best body text is #FFFFFF at 13.20:1 contrast (WCAG AA passes).

Color values

HEX	#5B181B
RGB	rgb(91, 24, 27)
HSL	hsl(357, 58%, 23%)
HSV	hsv(357, 74%, 36%)
CMYK	cmyk(0%, 73.6%, 70.3%, 64.3%)
CIE-LAB	lab(19.87, 30.70, 15.53)
CIE-LCH	lch(19.87, 34.40, 26.83°)
OKLab	oklab(32.11% 0.0905 0.0368)
OKLCH	oklch(32.11% 0.098 22.1)
XYZ	xyz(4.8393, 2.9572, 1.3527)
Luminance	0.0296 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5B181B #185B58

analogous

#5B183D #5B181B #5B3618

triadic

#5B181B #1B5B18 #181B5B

tetradic

#5B181B #3D5B18 #185B58 #36185B

square

#5B181B #3D5B18 #185B58 #36185B

split-complementary

#5B181B #185B36 #183D5B

monochromatic

#180607 #2B0B0D #5B181B #8B2529 #BC3238

Accessibility & contrast

On white

13.20

#5B181B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.59

#5B181B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #5B181B

13.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5B181B	#FFFFFF	#000000	##FFFFFF
##5B181B	1.00	13.20	1.59	13.20
#FFFFFF	13.20	1.00	21.00	1.00
#000000	1.59	21.00	1.00	21.00
##FFFFFF	13.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2A271B

Deuteranopia (green-blind)

#3B3519

Tritanopia (blue-blind)

#64061A

Achromatopsia (no color)

#303030

Design tokens & code

CSS

--color: #5b181b;
/* rgb */ color: rgb(91, 24, 27);
/* oklch */ color: oklch(32.1% 0.098 22.1);

Tailwind

colors: {
  custom: {
    50: '#8f5a57',
    500: '#5b181b',
    950: '#000000',
  },
}

SCSS

$custom: #5b181b;
$custom-light: #8f5a57;
$custom-dark: #000000;

JSON

{
  "hex": "#5b181b",
  "rgb": {
    "r": 91,
    "g": 24,
    "b": 27
  },
  "hsl": {
    "h": 357.313,
    "s": 58.261,
    "l": 22.549
  },
  "oklch": {
    "l": 0.32111,
    "c": 0.09766,
    "h": 22.1
  },
  "luminance": 0.02957
}

Semantic roles & 50–950 ramp

primary

#5B181B

secondary

#3D928E

accent

#E1DB46

background

#F9F5F5

surface

#F2E9E9

border

#CCC5C5

text

#0D0403

muted

#7E7978

Preview Lab

Preview with #5B181B

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

Preview Lab → · Contrast checker → · Palette generator →