#B31C2B#B31C2B

#B31C2B is a mid, vivid red. Relative luminance 0.106; OKLCH L 49.6% C 0.184 H 23.1°. Best body text is #FFFFFF at 6.74:1 contrast (WCAG AA passes).

Color values

HEX	#B31C2B
RGB	rgb(179, 28, 43)
HSL	hsl(354, 73%, 41%)
HSV	hsv(354, 84%, 70%)
CMYK	cmyk(0%, 84.4%, 76%, 29.8%)
CIE-LAB	lab(38.88, 58.04, 32.24)
CIE-LCH	lch(38.88, 66.39, 29.05°)
OKLab	oklab(49.57% 0.1689 0.0719)
OKLCH	oklch(49.57% 0.184 23.1)
XYZ	xyz(19.4441, 10.5918, 3.3057)
Luminance	0.1059 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31C2B #1CB3A4

analogous

#B31C76 #B31C2B #B3591C

triadic

#B31C2B #2BB31C #1C2BB3

tetradic

#B31C2B #76B31C #1CB3A4 #591CB3

square

#B31C2B #76B31C #1CB3A4 #591CB3

split-complementary

#B31C2B #1CB359 #1C76B3

monochromatic

#490B12 #7E141E #B31C2B #DE2E3F #E76370

Accessibility & contrast

On white

6.74

#B31C2B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.12

#B31C2B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31C2B

6.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31C2B	#FFFFFF	#000000	##FFFFFF
##B31C2B	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)

#4E472A

Deuteranopia (green-blind)

#736725

Tritanopia (blue-blind)

#C50024

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #b31c2b;
/* rgb */ color: rgb(179, 28, 43);
/* oklch */ color: oklch(49.6% 0.184 23.1);

Tailwind

colors: {
  custom: {
    50: '#d36a64',
    500: '#b31c2b',
    950: '#000000',
  },
}

SCSS

$custom: #b31c2b;
$custom-light: #d36a64;
$custom-dark: #000000;

JSON

{
  "hex": "#b31c2b",
  "rgb": {
    "r": 179,
    "g": 28,
    "b": 43
  },
  "hsl": {
    "h": 354.04,
    "s": 72.947,
    "l": 40.588
  },
  "oklch": {
    "l": 0.49572,
    "c": 0.1836,
    "h": 23.1
  },
  "luminance": 0.10589
}

Semantic roles & 50–950 ramp

primary

#B31C2B

secondary

#5FCBC1

accent

#F0DD38

background

#FEF6F6

surface

#FCECEB

border

#D5C7C6

text

#160705

muted

#847A7A

Preview Lab

Preview with #B31C2B

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

Preview Lab → · Contrast checker → · Palette generator →