#B31F17#B31F17

#B31F17 is a mid, vivid red. Relative luminance 0.106; OKLCH L 49.6% C 0.184 H 29.0°. Best body text is #FFFFFF at 6.72:1 contrast (WCAG AA passes).

Color values

HEX	#B31F17
RGB	rgb(179, 31, 23)
HSL	hsl(3, 77%, 40%)
HSV	hsv(3, 87%, 70%)
CMYK	cmyk(0%, 82.7%, 87.2%, 29.8%)
CIE-LAB	lab(38.95, 56.72, 43.33)
CIE-LCH	lch(38.95, 71.38, 37.38°)
OKLab	oklab(49.56% 0.1607 0.0891)
OKLCH	oklch(49.56% 0.184 29)
XYZ	xyz(19.2375, 10.6287, 1.8491)
Luminance	0.1063 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31F17 #17ABB3

analogous

#B3175D #B31F17 #B36D17

triadic

#B31F17 #17B31F #1F17B3

tetradic

#B31F17 #5DB317 #17ABB3 #6D17B3

square

#B31F17 #5DB317 #17ABB3 #6D17B3

split-complementary

#B31F17 #17B36D #175DB3

monochromatic

#470C09 #7D1610 #B31F17 #E32E24 #EA625B

Accessibility & contrast

On white

6.72

#B31F17 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.13

#B31F17 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31F17

6.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31F17	#FFFFFF	#000000	##FFFFFF
##B31F17	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)

#514713

Deuteranopia (green-blind)

#74670C

Tritanopia (blue-blind)

#C60020

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #b31f17;
/* rgb */ color: rgb(179, 31, 23);
/* oklch */ color: oklch(49.6% 0.184 29.0);

Tailwind

colors: {
  custom: {
    50: '#d46b57',
    500: '#b31f17',
    950: '#000000',
  },
}

SCSS

$custom: #b31f17;
$custom-light: #d46b57;
$custom-dark: #000000;

JSON

{
  "hex": "#b31f17",
  "rgb": {
    "r": 179,
    "g": 31,
    "b": 23
  },
  "hsl": {
    "h": 3.077,
    "s": 77.228,
    "l": 39.608
  },
  "oklch": {
    "l": 0.49558,
    "c": 0.18378,
    "h": 29
  },
  "luminance": 0.10626
}

Semantic roles & 50–950 ramp

primary

#B31F17

secondary

#58C7CD

accent

#EAF434

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160703

muted

#847A78

Preview Lab

Preview with #B31F17

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

Preview Lab → · Contrast checker → · Palette generator →