#831B1B#831B1B

#831B1B is a dark, vivid red. Relative luminance 0.057; OKLCH L 40.1% C 0.139 H 26.2°. Best body text is #FFFFFF at 9.82:1 contrast (WCAG AA passes).

Color values

HEX	#831B1B
RGB	rgb(131, 27, 27)
HSL	hsl(0, 66%, 31%)
HSV	hsv(0, 79%, 51%)
CMYK	cmyk(0%, 79.4%, 79.4%, 48.6%)
CIE-LAB	lab(28.62, 43.35, 27.83)
CIE-LCH	lch(28.62, 51.51, 32.70°)
OKLab	oklab(40.14% 0.125 0.0614)
OKLCH	oklch(40.14% 0.139 26.2)
XYZ	xyz(9.9510, 5.6899, 1.6110)
Luminance	0.0569 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#831B1B #1B8383

analogous

#831B4F #831B1B #834F1B

triadic

#831B1B #1B831B #1B1B83

tetradic

#831B1B #4F831B #1B8383 #4F1B83

square

#831B1B #4F831B #1B8383 #4F1B83

split-complementary

#831B1B #1B834F #1B4F83

monochromatic

#1E0606 #501111 #831B1B #B62525 #D84141

Accessibility & contrast

On white

9.82

#831B1B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#831B1B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #831B1B

9.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##831B1B	#FFFFFF	#000000	##FFFFFF
##831B1B	1.00	9.82	2.14	9.82
#FFFFFF	9.82	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3B351A

Deuteranopia (green-blind)

#554C17

Tritanopia (blue-blind)

#91001D

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #831b1b;
/* rgb */ color: rgb(131, 27, 27);
/* oklch */ color: oklch(40.1% 0.139 26.2);

Tailwind

colors: {
  custom: {
    50: '#af6158',
    500: '#831b1b',
    950: '#000000',
  },
}

SCSS

$custom: #831b1b;
$custom-light: #af6158;
$custom-dark: #000000;

JSON

{
  "hex": "#831b1b",
  "rgb": {
    "r": 131,
    "g": 27,
    "b": 27
  },
  "hsl": {
    "h": 0,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.40136,
    "c": 0.13928,
    "h": 26.2
  },
  "luminance": 0.05688
}

Semantic roles & 50–950 ramp

primary

#831B1B

secondary

#43B6B6

accent

#E9E93F

background

#FBF6F5

surface

#F6EBE9

border

#D0C6C5

text

#120503

muted

#817A78

Preview Lab

Preview with #831B1B

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

Preview Lab → · Contrast checker → · Palette generator →