#B31C21#B31C21

#B31C21 is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.5% C 0.185 H 26.1°. Best body text is #FFFFFF at 6.76:1 contrast (WCAG AA passes).

Color values

HEX	#B31C21
RGB	rgb(179, 28, 33)
HSL	hsl(358, 73%, 41%)
HSV	hsv(358, 84%, 70%)
CMYK	cmyk(0%, 84.4%, 81.6%, 29.8%)
CIE-LAB	lab(38.77, 57.71, 37.93)
CIE-LCH	lch(38.77, 69.06, 33.32°)
OKLab	oklab(49.45% 0.1657 0.0812)
OKLCH	oklch(49.45% 0.185 26.1)
XYZ	xyz(19.2826, 10.5272, 2.4552)
Luminance	0.1052 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31C21 #1CB3AE

analogous

#B31C6C #B31C21 #B3621C

triadic

#B31C21 #21B31C #1C21B3

tetradic

#B31C21 #6CB31C #1CB3AE #621CB3

square

#B31C21 #6CB31C #1CB3AE #621CB3

split-complementary

#B31C21 #1CB362 #1C6CB3

monochromatic

#490B0D #7E1417 #B31C21 #DE2E34 #E76367

Accessibility & contrast

On white

6.76

#B31C21 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#B31C21 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31C21

6.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31C21	#FFFFFF	#000000	##FFFFFF
##B31C21	1.00	6.76	3.10	6.76
#FFFFFF	6.76	1.00	21.00	1.00
#000000	3.10	21.00	1.00	21.00
##FFFFFF	6.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F471F

Deuteranopia (green-blind)

#736719

Tritanopia (blue-blind)

#C60020

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31c21;
/* rgb */ color: rgb(179, 28, 33);
/* oklch */ color: oklch(49.5% 0.185 26.1);

Tailwind

colors: {
  custom: {
    50: '#d46a5d',
    500: '#b31c21',
    950: '#000000',
  },
}

SCSS

$custom: #b31c21;
$custom-light: #d46a5d;
$custom-dark: #000000;

JSON

{
  "hex": "#b31c21",
  "rgb": {
    "r": 179,
    "g": 28,
    "b": 33
  },
  "hsl": {
    "h": 358.013,
    "s": 72.947,
    "l": 40.588
  },
  "oklch": {
    "l": 0.49454,
    "c": 0.18453,
    "h": 26.1
  },
  "luminance": 0.10524
}

Semantic roles & 50–950 ramp

primary

#B31C21

secondary

#5FCBC8

accent

#F0EA38

background

#FEF6F5

surface

#FCECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31C21

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

Preview Lab → · Contrast checker → · Palette generator →