#B31B17#B31B17

#B31B17 is a mid, vivid red. Relative luminance 0.104; OKLCH L 49.3% C 0.186 H 28.4°. Best body text is #FFFFFF at 6.81:1 contrast (WCAG AA passes).

Color values

HEX	#B31B17
RGB	rgb(179, 27, 23)
HSL	hsl(2, 77%, 40%)
HSV	hsv(2, 87%, 70%)
CMYK	cmyk(0%, 84.9%, 87.2%, 29.8%)
CIE-LAB	lab(38.61, 57.69, 43.05)
CIE-LCH	lch(38.61, 71.98, 36.73°)
OKLab	oklab(49.31% 0.1637 0.0885)
OKLCH	oklch(49.31% 0.186 28.4)
XYZ	xyz(19.1395, 10.4326, 1.8164)
Luminance	0.1043 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31B17 #17AFB3

analogous

#B31761 #B31B17 #B36917

triadic

#B31B17 #17B31B #1B17B3

tetradic

#B31B17 #61B317 #17AFB3 #6917B3

square

#B31B17 #61B317 #17AFB3 #6917B3

split-complementary

#B31B17 #17B369 #1761B3

monochromatic

#470B09 #7D1310 #B31B17 #E32924 #EA5E5B

Accessibility & contrast

On white

6.81

#B31B17 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.09

#B31B17 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31B17

6.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31B17	#FFFFFF	#000000	##FFFFFF
##B31B17	1.00	6.81	3.09	6.81
#FFFFFF	6.81	1.00	21.00	1.00
#000000	3.09	21.00	1.00	21.00
##FFFFFF	6.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F4613

Deuteranopia (green-blind)

#74660B

Tritanopia (blue-blind)

#C6001D

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31b17;
/* rgb */ color: rgb(179, 27, 23);
/* oklch */ color: oklch(49.3% 0.186 28.4);

Tailwind

colors: {
  custom: {
    50: '#d46a57',
    500: '#b31b17',
    950: '#000000',
  },
}

SCSS

$custom: #b31b17;
$custom-light: #d46a57;
$custom-dark: #000000;

JSON

{
  "hex": "#b31b17",
  "rgb": {
    "r": 179,
    "g": 27,
    "b": 23
  },
  "hsl": {
    "h": 1.538,
    "s": 77.228,
    "l": 39.608
  },
  "oklch": {
    "l": 0.49306,
    "c": 0.18611,
    "h": 28.4
  },
  "luminance": 0.10429
}

Semantic roles & 50–950 ramp

primary

#B31B17

secondary

#58CACD

accent

#EFF434

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160703

muted

#847A78

Preview Lab

Preview with #B31B17

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

Preview Lab → · Contrast checker → · Palette generator →