#B31D23#B31D23

#B31D23 is a mid, vivid red. Relative luminance 0.106; OKLCH L 49.5% C 0.184 H 25.7°. Best body text is #FFFFFF at 6.74:1 contrast (WCAG AA passes).

Color values

HEX	#B31D23
RGB	rgb(179, 29, 35)
HSL	hsl(358, 72%, 41%)
HSV	hsv(358, 84%, 70%)
CMYK	cmyk(0%, 83.8%, 80.4%, 29.8%)
CIE-LAB	lab(38.88, 57.53, 36.91)
CIE-LCH	lch(38.88, 68.35, 32.68°)
OKLab	oklab(49.54% 0.1656 0.0797)
OKLCH	oklch(49.54% 0.184 25.7)
XYZ	xyz(19.3356, 10.5870, 2.6152)
Luminance	0.1058 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31D23 #1DB3AD

analogous

#B31D6E #B31D23 #B3621D

triadic

#B31D23 #23B31D #1D23B3

tetradic

#B31D23 #6EB31D #1DB3AD #621DB3

square

#B31D23 #6EB31D #1DB3AD #621DB3

split-complementary

#B31D23 #1DB362 #1D6EB3

monochromatic

#4A0C0E #7E1419 #B31D23 #DD3037 #E6646A

Accessibility & contrast

On white

6.74

#B31D23 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.12

#B31D23 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31D23

6.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31D23	#FFFFFF	#000000	##FFFFFF
##B31D23	1.00	6.74	3.12	6.74
#FFFFFF	6.74	1.00	21.00	1.00
#000000	3.12	21.00	1.00	21.00
##FFFFFF	6.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F4721

Deuteranopia (green-blind)

#73671C

Tritanopia (blue-blind)

#C60022

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #b31d23;
/* rgb */ color: rgb(179, 29, 35);
/* oklch */ color: oklch(49.5% 0.184 25.7);

Tailwind

colors: {
  custom: {
    50: '#d46a5f',
    500: '#b31d23',
    950: '#000000',
  },
}

SCSS

$custom: #b31d23;
$custom-light: #d46a5f;
$custom-dark: #000000;

JSON

{
  "hex": "#b31d23",
  "rgb": {
    "r": 179,
    "g": 29,
    "b": 35
  },
  "hsl": {
    "h": 357.6,
    "s": 72.115,
    "l": 40.784
  },
  "oklch": {
    "l": 0.49537,
    "c": 0.18373,
    "h": 25.7
  },
  "luminance": 0.10584
}

Semantic roles & 50–950 ramp

primary

#B31D23

secondary

#61CBC7

accent

#EFE839

background

#FEF6F5

surface

#FCECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31D23

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

Preview Lab → · Contrast checker → · Palette generator →