#B31D1C#B31D1C

#B31D1C is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.5% C 0.184 H 27.6°. Best body text is #FFFFFF at 6.75:1 contrast (WCAG AA passes).

Color values

HEX	#B31D1C
RGB	rgb(179, 29, 28)
HSL	hsl(0, 73%, 41%)
HSV	hsv(0, 84%, 70%)
CMYK	cmyk(0%, 83.8%, 84.4%, 29.8%)
CIE-LAB	lab(38.81, 57.33, 40.68)
CIE-LCH	lch(38.81, 70.30, 35.36°)
OKLab	oklab(49.47% 0.1635 0.0853)
OKLCH	oklch(49.47% 0.184 27.6)
XYZ	xyz(19.2418, 10.5495, 2.1215)
Luminance	0.1055 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31D1C #1CB2B3

analogous

#B31C67 #B31D1C #B3681C

triadic

#B31D1C #1CB31D #1D1CB3

tetradic

#B31D1C #67B31C #1CB2B3 #681CB3

square

#B31D1C #67B31C #1CB2B3 #681CB3

split-complementary

#B31D1C #1CB368 #1C67B3

monochromatic

#490C0B #7E1414 #B31D1C #DE2F2E #E76463

Accessibility & contrast

On white

6.75

#B31D1C on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.11

#B31D1C on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31D1C

6.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31D1C	#FFFFFF	#000000	##FFFFFF
##B31D1C	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)

#504719

Deuteranopia (green-blind)

#746713

Tritanopia (blue-blind)

#C60020

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31d1c;
/* rgb */ color: rgb(179, 29, 28);
/* oklch */ color: oklch(49.5% 0.184 27.6);

Tailwind

colors: {
  custom: {
    50: '#d46a5a',
    500: '#b31d1c',
    950: '#000000',
  },
}

SCSS

$custom: #b31d1c;
$custom-light: #d46a5a;
$custom-dark: #000000;

JSON

{
  "hex": "#b31d1c",
  "rgb": {
    "r": 179,
    "g": 29,
    "b": 28
  },
  "hsl": {
    "h": 0.397,
    "s": 72.947,
    "l": 40.588
  },
  "oklch": {
    "l": 0.49468,
    "c": 0.18446,
    "h": 27.6
  },
  "luminance": 0.10546
}

Semantic roles & 50–950 ramp

primary

#B31D1C

secondary

#5FCBCB

accent

#EEF038

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31D1C

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

Preview Lab → · Contrast checker → · Palette generator →