#B31D1D#B31D1D

#B31D1D is a mid, vivid red. Relative luminance 0.106; OKLCH L 49.5% C 0.184 H 27.3°. Best body text is #FFFFFF at 6.75:1 contrast (WCAG AA passes).

Color values

HEX	#B31D1D
RGB	rgb(179, 29, 29)
HSL	hsl(0, 72%, 41%)
HSV	hsv(0, 84%, 70%)
CMYK	cmyk(0%, 83.8%, 83.8%, 29.8%)
CIE-LAB	lab(38.82, 57.36, 40.16)
CIE-LCH	lch(38.82, 70.02, 35.00°)
OKLab	oklab(49.48% 0.1638 0.0846)
OKLCH	oklch(49.48% 0.184 27.3)
XYZ	xyz(19.2540, 10.5543, 2.1856)
Luminance	0.1055 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31D1D #1DB3B3

analogous

#B31D68 #B31D1D #B3681D

triadic

#B31D1D #1DB31D #1D1DB3

tetradic

#B31D1D #68B31D #1DB3B3 #681DB3

square

#B31D1D #68B31D #1DB3B3 #681DB3

split-complementary

#B31D1D #1DB368 #1D68B3

monochromatic

#4A0C0C #7E1414 #B31D1D #DD3030 #E66464

Accessibility & contrast

On white

6.75

#B31D1D on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.11

#B31D1D on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31D1D

6.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31D1D	#FFFFFF	#000000	##FFFFFF
##B31D1D	1.00	6.75	3.11	6.75
#FFFFFF	6.75	1.00	21.00	1.00
#000000	3.11	21.00	1.00	21.00
##FFFFFF	6.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F471A

Deuteranopia (green-blind)

#746714

Tritanopia (blue-blind)

#C60020

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31d1d;
/* rgb */ color: rgb(179, 29, 29);
/* oklch */ color: oklch(49.5% 0.184 27.3);

Tailwind

colors: {
  custom: {
    50: '#d46a5b',
    500: '#b31d1d',
    950: '#000000',
  },
}

SCSS

$custom: #b31d1d;
$custom-light: #d46a5b;
$custom-dark: #000000;

JSON

{
  "hex": "#b31d1d",
  "rgb": {
    "r": 179,
    "g": 29,
    "b": 29
  },
  "hsl": {
    "h": 0,
    "s": 72.115,
    "l": 40.784
  },
  "oklch": {
    "l": 0.49477,
    "c": 0.18435,
    "h": 27.3
  },
  "luminance": 0.10551
}

Semantic roles & 50–950 ramp

primary

#B31D1D

secondary

#61CBCB

accent

#EFEF39

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31D1D

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

Preview Lab → · Contrast checker → · Palette generator →