#B31F18#B31F18

#B31F18 is a mid, vivid red. Relative luminance 0.106; OKLCH L 49.6% C 0.184 H 28.8°. Best body text is #FFFFFF at 6.72:1 contrast (WCAG AA passes).

Color values

HEX	#B31F18
RGB	rgb(179, 31, 24)
HSL	hsl(3, 76%, 40%)
HSV	hsv(3, 87%, 70%)
CMYK	cmyk(0%, 82.7%, 86.6%, 29.8%)
CIE-LAB	lab(38.95, 56.74, 42.85)
CIE-LCH	lch(38.95, 71.10, 37.06°)
OKLab	oklab(49.57% 0.161 0.0885)
OKLCH	oklch(49.57% 0.184 28.8)
XYZ	xyz(19.2477, 10.6328, 1.9029)
Luminance	0.1063 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31F18 #18ACB3

analogous

#B3185E #B31F18 #B36D18

triadic

#B31F18 #18B31F #1F18B3

tetradic

#B31F18 #5EB318 #18ACB3 #6D18B3

square

#B31F18 #5EB318 #18ACB3 #6D18B3

split-complementary

#B31F18 #18B36D #185EB3

monochromatic

#470C0A #7D1611 #B31F18 #E22F26 #E9635C

Accessibility & contrast

On white

6.72

#B31F18 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.13

#B31F18 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31F18

6.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31F18	#FFFFFF	#000000	##FFFFFF
##B31F18	1.00	6.72	3.13	6.72
#FFFFFF	6.72	1.00	21.00	1.00
#000000	3.13	21.00	1.00	21.00
##FFFFFF	6.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#504714

Deuteranopia (green-blind)

#74670D

Tritanopia (blue-blind)

#C60020

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #b31f18;
/* rgb */ color: rgb(179, 31, 24);
/* oklch */ color: oklch(49.6% 0.184 28.8);

Tailwind

colors: {
  custom: {
    50: '#d46b57',
    500: '#b31f18',
    950: '#000000',
  },
}

SCSS

$custom: #b31f18;
$custom-light: #d46b57;
$custom-dark: #000000;

JSON

{
  "hex": "#b31f18",
  "rgb": {
    "r": 179,
    "g": 31,
    "b": 24
  },
  "hsl": {
    "h": 2.71,
    "s": 76.355,
    "l": 39.804
  },
  "oklch": {
    "l": 0.49565,
    "c": 0.18368,
    "h": 28.8
  },
  "luminance": 0.1063
}

Semantic roles & 50–950 ramp

primary

#B31F18

secondary

#5AC8CD

accent

#EAF335

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160803

muted

#847A78

Preview Lab

Preview with #B31F18

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

Preview Lab → · Contrast checker → · Palette generator →