#B31B1C#B31B1C

#B31B1C is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.3% C 0.186 H 27.3°. Best body text is #FFFFFF at 6.80:1 contrast (WCAG AA passes).

Color values

HEX	#B31B1C
RGB	rgb(179, 27, 28)
HSL	hsl(360, 74%, 40%)
HSV	hsv(360, 85%, 70%)
CMYK	cmyk(0%, 84.9%, 84.4%, 29.8%)
CIE-LAB	lab(38.65, 57.80, 40.53)
CIE-LCH	lch(38.65, 70.60, 35.04°)
OKLab	oklab(49.35% 0.165 0.085)
OKLCH	oklch(49.35% 0.186 27.3)
XYZ	xyz(19.1944, 10.4546, 2.1057)
Luminance	0.1045 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31B1C #1BB3B2

analogous

#B31B68 #B31B1C #B3661B

triadic

#B31B1C #1CB31B #1B1CB3

tetradic

#B31B1C #68B31B #1BB3B2 #661BB3

square

#B31B1C #68B31B #1BB3B2 #661BB3

split-complementary

#B31B1C #1BB366 #1B68B3

monochromatic

#490B0B #7E1314 #B31B1C #DF2C2D #E76162

Accessibility & contrast

On white

6.80

#B31B1C on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.09

#B31B1C on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31B1C

6.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31B1C	#FFFFFF	#000000	##FFFFFF
##B31B1C	1.00	6.80	3.09	6.80
#FFFFFF	6.80	1.00	21.00	1.00
#000000	3.09	21.00	1.00	21.00
##FFFFFF	6.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F4619

Deuteranopia (green-blind)

#736613

Tritanopia (blue-blind)

#C6001E

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31b1c;
/* rgb */ color: rgb(179, 27, 28);
/* oklch */ color: oklch(49.3% 0.186 27.3);

Tailwind

colors: {
  custom: {
    50: '#d46a5a',
    500: '#b31b1c',
    950: '#000000',
  },
}

SCSS

$custom: #b31b1c;
$custom-light: #d46a5a;
$custom-dark: #000000;

JSON

{
  "hex": "#b31b1c",
  "rgb": {
    "r": 179,
    "g": 27,
    "b": 28
  },
  "hsl": {
    "h": 359.605,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.49346,
    "c": 0.18561,
    "h": 27.3
  },
  "luminance": 0.10451
}

Semantic roles & 50–950 ramp

primary

#B31B1C

secondary

#5ECCCB

accent

#F0EF37

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31B1C

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

Preview Lab → · Contrast checker → · Palette generator →