#B31F1D#B31F1D

#B31F1D is a mid, vivid red. Relative luminance 0.107; OKLCH L 49.6% C 0.183 H 27.6°. Best body text is #FFFFFF at 6.71:1 contrast (WCAG AA passes).

Color values

HEX	#B31F1D
RGB	rgb(179, 31, 29)
HSL	hsl(1, 72%, 41%)
HSV	hsv(1, 84%, 70%)
CMYK	cmyk(0%, 82.7%, 83.8%, 29.8%)
CIE-LAB	lab(38.99, 56.86, 40.32)
CIE-LCH	lch(38.99, 69.71, 35.34°)
OKLab	oklab(49.61% 0.1622 0.085)
OKLCH	oklch(49.61% 0.183 27.6)
XYZ	xyz(19.3046, 10.6556, 2.2025)
Luminance	0.1065 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31F1D #1DB1B3

analogous

#B31D66 #B31F1D #B36A1D

triadic

#B31F1D #1DB31F #1F1DB3

tetradic

#B31F1D #66B31D #1DB1B3 #6A1DB3

square

#B31F1D #66B31D #1DB1B3 #6A1DB3

split-complementary

#B31F1D #1DB36A #1D66B3

monochromatic

#4A0D0C #7E1614 #B31F1D #DD3230 #E66664

Accessibility & contrast

On white

6.71

#B31F1D on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.13

#B31F1D on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31F1D

6.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31F1D	#FFFFFF	#000000	##FFFFFF
##B31F1D	1.00	6.71	3.13	6.71
#FFFFFF	6.71	1.00	21.00	1.00
#000000	3.13	21.00	1.00	21.00
##FFFFFF	6.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#50471A

Deuteranopia (green-blind)

#746714

Tritanopia (blue-blind)

#C60021

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #b31f1d;
/* rgb */ color: rgb(179, 31, 29);
/* oklch */ color: oklch(49.6% 0.183 27.6);

Tailwind

colors: {
  custom: {
    50: '#d46b5b',
    500: '#b31f1d',
    950: '#000000',
  },
}

SCSS

$custom: #b31f1d;
$custom-light: #d46b5b;
$custom-dark: #000000;

JSON

{
  "hex": "#b31f1d",
  "rgb": {
    "r": 179,
    "g": 31,
    "b": 29
  },
  "hsl": {
    "h": 0.8,
    "s": 72.115,
    "l": 40.784
  },
  "oklch": {
    "l": 0.49607,
    "c": 0.18314,
    "h": 27.6
  },
  "luminance": 0.10652
}

Semantic roles & 50–950 ramp

primary

#B31F1D

secondary

#61CACB

accent

#ECEF39

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160804

muted

#847A79

Preview Lab

Preview with #B31F1D

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

Preview Lab → · Contrast checker → · Palette generator →