#B31D1E#B31D1E

#B31D1E is a mid, vivid red. Relative luminance 0.106; OKLCH L 49.5% C 0.184 H 27.1°. Best body text is #FFFFFF at 6.75:1 contrast (WCAG AA passes).

Color values

HEX	#B31D1E
RGB	rgb(179, 29, 30)
HSL	hsl(360, 72%, 41%)
HSV	hsv(360, 84%, 70%)
CMYK	cmyk(0%, 83.8%, 83.2%, 29.8%)
CIE-LAB	lab(38.83, 57.39, 39.63)
CIE-LCH	lch(38.83, 69.74, 34.63°)
OKLab	oklab(49.49% 0.1641 0.0838)
OKLCH	oklch(49.49% 0.184 27.1)
XYZ	xyz(19.2665, 10.5594, 2.2518)
Luminance	0.1056 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31D1E #1DB3B2

analogous

#B31D69 #B31D1E #B3671D

triadic

#B31D1E #1EB31D #1D1EB3

tetradic

#B31D1E #69B31D #1DB3B2 #671DB3

square

#B31D1E #69B31D #1DB3B2 #671DB3

split-complementary

#B31D1E #1DB367 #1D69B3

monochromatic

#4A0C0C #7E1415 #B31D1E #DD3031 #E66465

Accessibility & contrast

On white

6.75

#B31D1E on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.11

#B31D1E on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31D1E

6.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31D1E	#FFFFFF	#000000	##FFFFFF
##B31D1E	1.00	6.75	3.11	6.75
#FFFFFF	6.75	1.00	21.00	1.00
#000000	3.11	21.00	1.00	21.00
##FFFFFF	6.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F471C

Deuteranopia (green-blind)

#746716

Tritanopia (blue-blind)

#C60020

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31d1e;
/* rgb */ color: rgb(179, 29, 30);
/* oklch */ color: oklch(49.5% 0.184 27.1);

Tailwind

colors: {
  custom: {
    50: '#d46a5b',
    500: '#b31d1e',
    950: '#000000',
  },
}

SCSS

$custom: #b31d1e;
$custom-light: #d46a5b;
$custom-dark: #000000;

JSON

{
  "hex": "#b31d1e",
  "rgb": {
    "r": 179,
    "g": 29,
    "b": 30
  },
  "hsl": {
    "h": 359.6,
    "s": 72.115,
    "l": 40.784
  },
  "oklch": {
    "l": 0.49486,
    "c": 0.18425,
    "h": 27.1
  },
  "luminance": 0.10556
}

Semantic roles & 50–950 ramp

primary

#B31D1E

secondary

#61CBCA

accent

#EFEE39

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31D1E

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

Preview Lab → · Contrast checker → · Palette generator →