#B31B2C#B31B2C

#B31B2C is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.5% C 0.184 H 22.6°. Best body text is #FFFFFF at 6.75:1 contrast (WCAG AA passes).

Color values

HEX	#B31B2C
RGB	rgb(179, 27, 44)
HSL	hsl(353, 74%, 40%)
HSV	hsv(353, 85%, 70%)
CMYK	cmyk(0%, 84.9%, 75.4%, 29.8%)
CIE-LAB	lab(38.82, 58.31, 31.56)
CIE-LCH	lch(38.82, 66.30, 28.42°)
OKLab	oklab(49.53% 0.17 0.0707)
OKLCH	oklch(49.53% 0.184 22.6)
XYZ	xyz(19.4393, 10.5526, 3.3957)
Luminance	0.1055 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31B2C #1BB3A2

analogous

#B31B78 #B31B2C #B3561B

triadic

#B31B2C #2CB31B #1B2CB3

tetradic

#B31B2C #78B31B #1BB3A2 #561BB3

square

#B31B2C #78B31B #1BB3A2 #561BB3

split-complementary

#B31B2C #1BB356 #1B78B3

monochromatic

#490B12 #7E131F #B31B2C #DF2C40 #E76170

Accessibility & contrast

On white

6.75

#B31B2C on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.11

#B31B2C on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31B2C

6.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31B2C	#FFFFFF	#000000	##FFFFFF
##B31B2C	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)

#4D472B

Deuteranopia (green-blind)

#726726

Tritanopia (blue-blind)

#C50024

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31b2c;
/* rgb */ color: rgb(179, 27, 44);
/* oklch */ color: oklch(49.5% 0.184 22.6);

Tailwind

colors: {
  custom: {
    50: '#d36a65',
    500: '#b31b2c',
    950: '#000000',
  },
}

SCSS

$custom: #b31b2c;
$custom-light: #d36a65;
$custom-dark: #000000;

JSON

{
  "hex": "#b31b2c",
  "rgb": {
    "r": 179,
    "g": 27,
    "b": 44
  },
  "hsl": {
    "h": 353.289,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.49526,
    "c": 0.18412,
    "h": 22.6
  },
  "luminance": 0.10549
}

Semantic roles & 50–950 ramp

primary

#B31B2C

secondary

#5ECCBF

accent

#F0DC37

background

#FEF6F6

surface

#FCECEB

border

#D5C7C6

text

#160705

muted

#847A7A

Preview Lab

Preview with #B31B2C

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

Preview Lab → · Contrast checker → · Palette generator →