#B31C17#B31C17

#B31C17 is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.4% C 0.186 H 28.5°. Best body text is #FFFFFF at 6.78:1 contrast (WCAG AA passes).

Color values

HEX	#B31C17
RGB	rgb(179, 28, 23)
HSL	hsl(2, 77%, 40%)
HSV	hsv(2, 87%, 70%)
CMYK	cmyk(0%, 84.4%, 87.2%, 29.8%)
CIE-LAB	lab(38.69, 57.46, 43.12)
CIE-LCH	lch(38.69, 71.83, 36.88°)
OKLab	oklab(49.37% 0.163 0.0886)
OKLCH	oklch(49.37% 0.186 28.5)
XYZ	xyz(19.1628, 10.4793, 1.8242)
Luminance	0.1048 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31C17 #17AEB3

analogous

#B31760 #B31C17 #B36A17

triadic

#B31C17 #17B31C #1C17B3

tetradic

#B31C17 #60B317 #17AEB3 #6A17B3

square

#B31C17 #60B317 #17AEB3 #6A17B3

split-complementary

#B31C17 #17B36A #1760B3

monochromatic

#470B09 #7D1410 #B31C17 #E32A24 #EA5F5B

Accessibility & contrast

On white

6.78

#B31C17 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#B31C17 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31C17

6.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31C17	#FFFFFF	#000000	##FFFFFF
##B31C17	1.00	6.78	3.10	6.78
#FFFFFF	6.78	1.00	21.00	1.00
#000000	3.10	21.00	1.00	21.00
##FFFFFF	6.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F4613

Deuteranopia (green-blind)

#74670B

Tritanopia (blue-blind)

#C6001E

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31c17;
/* rgb */ color: rgb(179, 28, 23);
/* oklch */ color: oklch(49.4% 0.186 28.5);

Tailwind

colors: {
  custom: {
    50: '#d46a57',
    500: '#b31c17',
    950: '#000000',
  },
}

SCSS

$custom: #b31c17;
$custom-light: #d46a57;
$custom-dark: #000000;

JSON

{
  "hex": "#b31c17",
  "rgb": {
    "r": 179,
    "g": 28,
    "b": 23
  },
  "hsl": {
    "h": 1.923,
    "s": 77.228,
    "l": 39.608
  },
  "oklch": {
    "l": 0.49366,
    "c": 0.18555,
    "h": 28.5
  },
  "luminance": 0.10476
}

Semantic roles & 50–950 ramp

primary

#B31C17

secondary

#58CACD

accent

#EEF434

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160703

muted

#847A78

Preview Lab

Preview with #B31C17

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

Preview Lab → · Contrast checker → · Palette generator →