#B31D18#B31D18

#B31D18 is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.4% C 0.185 H 28.5°. Best body text is #FFFFFF at 6.76:1 contrast (WCAG AA passes).

Color values

HEX	#B31D18
RGB	rgb(179, 29, 24)
HSL	hsl(2, 76%, 40%)
HSV	hsv(2, 87%, 70%)
CMYK	cmyk(0%, 83.8%, 86.6%, 29.8%)
CIE-LAB	lab(38.78, 57.24, 42.70)
CIE-LCH	lch(38.78, 71.41, 36.72°)
OKLab	oklab(49.44% 0.1625 0.0881)
OKLCH	oklch(49.44% 0.185 28.5)
XYZ	xyz(19.1971, 10.5316, 1.8860)
Luminance	0.1053 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31D18 #18AEB3

analogous

#B31861 #B31D18 #B36A18

triadic

#B31D18 #18B31D #1D18B3

tetradic

#B31D18 #61B318 #18AEB3 #6A18B3

square

#B31D18 #61B318 #18AEB3 #6A18B3

split-complementary

#B31D18 #18B36A #1861B3

monochromatic

#470C0A #7D1411 #B31D18 #E22C26 #E9615C

Accessibility & contrast

On white

6.76

#B31D18 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.11

#B31D18 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31D18

6.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31D18	#FFFFFF	#000000	##FFFFFF
##B31D18	1.00	6.76	3.11	6.76
#FFFFFF	6.76	1.00	21.00	1.00
#000000	3.11	21.00	1.00	21.00
##FFFFFF	6.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#504715

Deuteranopia (green-blind)

#74670D

Tritanopia (blue-blind)

#C6001F

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31d18;
/* rgb */ color: rgb(179, 29, 24);
/* oklch */ color: oklch(49.4% 0.185 28.5);

Tailwind

colors: {
  custom: {
    50: '#d46a57',
    500: '#b31d18',
    950: '#000000',
  },
}

SCSS

$custom: #b31d18;
$custom-light: #d46a57;
$custom-dark: #000000;

JSON

{
  "hex": "#b31d18",
  "rgb": {
    "r": 179,
    "g": 29,
    "b": 24
  },
  "hsl": {
    "h": 1.935,
    "s": 76.355,
    "l": 39.804
  },
  "oklch": {
    "l": 0.49435,
    "c": 0.18487,
    "h": 28.5
  },
  "luminance": 0.10528
}

Semantic roles & 50–950 ramp

primary

#B31D18

secondary

#5AC9CD

accent

#EDF335

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160703

muted

#847A78

Preview Lab

Preview with #B31D18

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

Preview Lab → · Contrast checker → · Palette generator →