#B31B21#B31B21

#B31B21 is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.4% C 0.185 H 26.0°. Best body text is #FFFFFF at 6.78:1 contrast (WCAG AA passes).

Color values

HEX	#B31B21
RGB	rgb(179, 27, 33)
HSL	hsl(358, 74%, 40%)
HSV	hsv(358, 85%, 70%)
CMYK	cmyk(0%, 84.9%, 81.6%, 29.8%)
CIE-LAB	lab(38.69, 57.94, 37.85)
CIE-LCH	lch(38.69, 69.21, 33.16°)
OKLab	oklab(49.39% 0.1664 0.081)
OKLCH	oklch(49.39% 0.185 26)
XYZ	xyz(19.2593, 10.4806, 2.4475)
Luminance	0.1048 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31B21 #1BB3AD

analogous

#B31B6D #B31B21 #B3611B

triadic

#B31B21 #21B31B #1B21B3

tetradic

#B31B21 #6DB31B #1BB3AD #611BB3

square

#B31B21 #6DB31B #1BB3AD #611BB3

split-complementary

#B31B21 #1BB361 #1B6DB3

monochromatic

#490B0D #7E1317 #B31B21 #DF2C33 #E76166

Accessibility & contrast

On white

6.78

#B31B21 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#B31B21 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31B21

6.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31B21	#FFFFFF	#000000	##FFFFFF
##B31B21	1.00	6.78	3.10	6.78
#FFFFFF	6.78	1.00	21.00	1.00
#000000	3.10	21.00	1.00	21.00
##FFFFFF	6.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4E461F

Deuteranopia (green-blind)

#736719

Tritanopia (blue-blind)

#C60020

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31b21;
/* rgb */ color: rgb(179, 27, 33);
/* oklch */ color: oklch(49.4% 0.185 26.0);

Tailwind

colors: {
  custom: {
    50: '#d46a5d',
    500: '#b31b21',
    950: '#000000',
  },
}

SCSS

$custom: #b31b21;
$custom-light: #d46a5d;
$custom-dark: #000000;

JSON

{
  "hex": "#b31b21",
  "rgb": {
    "r": 179,
    "g": 27,
    "b": 33
  },
  "hsl": {
    "h": 357.632,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.49394,
    "c": 0.1851,
    "h": 26
  },
  "luminance": 0.10477
}

Semantic roles & 50–950 ramp

primary

#B31B21

secondary

#5ECCC7

accent

#F0E937

background

#FEF6F5

surface

#FCECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31B21

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

Preview Lab → · Contrast checker → · Palette generator →