#B31D21#B31D21

#B31D21 is a mid, vivid red. Relative luminance 0.106; OKLCH L 49.5% C 0.184 H 26.3°. Best body text is #FFFFFF at 6.74:1 contrast (WCAG AA passes).

Color values

HEX	#B31D21
RGB	rgb(179, 29, 33)
HSL	hsl(358, 72%, 41%)
HSV	hsv(358, 84%, 70%)
CMYK	cmyk(0%, 83.8%, 81.6%, 29.8%)
CIE-LAB	lab(38.86, 57.47, 38.01)
CIE-LCH	lch(38.86, 68.91, 33.48°)
OKLab	oklab(49.52% 0.1649 0.0814)
OKLCH	oklch(49.52% 0.184 26.3)
XYZ	xyz(19.3067, 10.5754, 2.4633)
Luminance	0.1057 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31D21 #1DB3AF

analogous

#B31D6C #B31D21 #B3641D

triadic

#B31D21 #21B31D #1D21B3

tetradic

#B31D21 #6CB31D #1DB3AF #641DB3

square

#B31D21 #6CB31D #1DB3AF #641DB3

split-complementary

#B31D21 #1DB364 #1D6CB3

monochromatic

#4A0C0E #7E1417 #B31D21 #DD3034 #E66468

Accessibility & contrast

On white

6.74

#B31D21 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.11

#B31D21 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31D21

6.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31D21	#FFFFFF	#000000	##FFFFFF
##B31D21	1.00	6.74	3.11	6.74
#FFFFFF	6.74	1.00	21.00	1.00
#000000	3.11	21.00	1.00	21.00
##FFFFFF	6.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F471F

Deuteranopia (green-blind)

#736719

Tritanopia (blue-blind)

#C60021

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31d21;
/* rgb */ color: rgb(179, 29, 33);
/* oklch */ color: oklch(49.5% 0.184 26.3);

Tailwind

colors: {
  custom: {
    50: '#d46a5d',
    500: '#b31d21',
    950: '#000000',
  },
}

SCSS

$custom: #b31d21;
$custom-light: #d46a5d;
$custom-dark: #000000;

JSON

{
  "hex": "#b31d21",
  "rgb": {
    "r": 179,
    "g": 29,
    "b": 33
  },
  "hsl": {
    "h": 358.4,
    "s": 72.115,
    "l": 40.784
  },
  "oklch": {
    "l": 0.49516,
    "c": 0.18393,
    "h": 26.3
  },
  "luminance": 0.10572
}

Semantic roles & 50–950 ramp

primary

#B31D21

secondary

#61CBC8

accent

#EFEA39

background

#FEF6F5

surface

#FCECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31D21

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

Preview Lab → · Contrast checker → · Palette generator →