#B31D17#B31D17

#B31D17 is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.4% C 0.185 H 28.7°. Best body text is #FFFFFF at 6.76:1 contrast (WCAG AA passes).

Color values

HEX	#B31D17
RGB	rgb(179, 29, 23)
HSL	hsl(2, 77%, 40%)
HSV	hsv(2, 87%, 70%)
CMYK	cmyk(0%, 83.8%, 87.2%, 29.8%)
CIE-LAB	lab(38.77, 57.22, 43.19)
CIE-LCH	lch(38.77, 71.69, 37.04°)
OKLab	oklab(49.43% 0.1623 0.0888)
OKLCH	oklch(49.43% 0.185 28.7)
XYZ	xyz(19.1869, 10.5275, 1.8322)
Luminance	0.1052 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31D17 #17ADB3

analogous

#B3175F #B31D17 #B36B17

triadic

#B31D17 #17B31D #1D17B3

tetradic

#B31D17 #5FB317 #17ADB3 #6B17B3

square

#B31D17 #5FB317 #17ADB3 #6B17B3

split-complementary

#B31D17 #17B36B #175FB3

monochromatic

#470B09 #7D1410 #B31D17 #E32C24 #EA605B

Accessibility & contrast

On white

6.76

#B31D17 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#B31D17 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31D17

6.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31D17	#FFFFFF	#000000	##FFFFFF
##B31D17	1.00	6.76	3.10	6.76
#FFFFFF	6.76	1.00	21.00	1.00
#000000	3.10	21.00	1.00	21.00
##FFFFFF	6.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#504713

Deuteranopia (green-blind)

#74670B

Tritanopia (blue-blind)

#C6001E

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31d17;
/* rgb */ color: rgb(179, 29, 23);
/* oklch */ color: oklch(49.4% 0.185 28.7);

Tailwind

colors: {
  custom: {
    50: '#d46a57',
    500: '#b31d17',
    950: '#000000',
  },
}

SCSS

$custom: #b31d17;
$custom-light: #d46a57;
$custom-dark: #000000;

JSON

{
  "hex": "#b31d17",
  "rgb": {
    "r": 179,
    "g": 29,
    "b": 23
  },
  "hsl": {
    "h": 2.308,
    "s": 77.228,
    "l": 39.608
  },
  "oklch": {
    "l": 0.49428,
    "c": 0.18497,
    "h": 28.7
  },
  "luminance": 0.10524
}

Semantic roles & 50–950 ramp

primary

#B31D17

secondary

#58C9CD

accent

#ECF434

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160703

muted

#847A78

Preview Lab

Preview with #B31D17

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

Preview Lab → · Contrast checker → · Palette generator →