#B31B18#B31B18

#B31B18 is a mid, vivid red. Relative luminance 0.104; OKLCH L 49.3% C 0.186 H 28.2°. Best body text is #FFFFFF at 6.80:1 contrast (WCAG AA passes).

Color values

HEX	#B31B18
RGB	rgb(179, 27, 24)
HSL	hsl(1, 76%, 40%)
HSV	hsv(1, 87%, 70%)
CMYK	cmyk(0%, 84.9%, 86.6%, 29.8%)
CIE-LAB	lab(38.62, 57.71, 42.56)
CIE-LCH	lch(38.62, 71.71, 36.41°)
OKLab	oklab(49.31% 0.164 0.0878)
OKLCH	oklch(49.31% 0.186 28.2)
XYZ	xyz(19.1497, 10.4367, 1.8702)
Luminance	0.1043 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31B18 #18B0B3

analogous

#B31863 #B31B18 #B36818

triadic

#B31B18 #18B31B #1B18B3

tetradic

#B31B18 #63B318 #18B0B3 #6818B3

square

#B31B18 #63B318 #18B0B3 #6818B3

split-complementary

#B31B18 #18B368 #1863B3

monochromatic

#470B0A #7D1311 #B31B18 #E22A26 #E95F5C

Accessibility & contrast

On white

6.80

#B31B18 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.09

#B31B18 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31B18

6.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31B18	#FFFFFF	#000000	##FFFFFF
##B31B18	1.00	6.80	3.09	6.80
#FFFFFF	6.80	1.00	21.00	1.00
#000000	3.09	21.00	1.00	21.00
##FFFFFF	6.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F4615

Deuteranopia (green-blind)

#73660D

Tritanopia (blue-blind)

#C6001D

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31b18;
/* rgb */ color: rgb(179, 27, 24);
/* oklch */ color: oklch(49.3% 0.186 28.2);

Tailwind

colors: {
  custom: {
    50: '#d46a57',
    500: '#b31b18',
    950: '#000000',
  },
}

SCSS

$custom: #b31b18;
$custom-light: #d46a57;
$custom-dark: #000000;

JSON

{
  "hex": "#b31b18",
  "rgb": {
    "r": 179,
    "g": 27,
    "b": 24
  },
  "hsl": {
    "h": 1.161,
    "s": 76.355,
    "l": 39.804
  },
  "oklch": {
    "l": 0.49313,
    "c": 0.18601,
    "h": 28.2
  },
  "luminance": 0.10434
}

Semantic roles & 50–950 ramp

primary

#B31B18

secondary

#5ACBCD

accent

#EFF335

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160703

muted

#847A78

Preview Lab

Preview with #B31B18

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

Preview Lab → · Contrast checker → · Palette generator →