#B31C1A#B31C1A

#B31C1A is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.4% C 0.185 H 27.9°. Best body text is #FFFFFF at 6.78:1 contrast (WCAG AA passes).

Color values

HEX	#B31C1A
RGB	rgb(179, 28, 26)
HSL	hsl(1, 75%, 40%)
HSV	hsv(1, 85%, 70%)
CMYK	cmyk(0%, 84.4%, 85.5%, 29.8%)
CIE-LAB	lab(38.71, 57.52, 41.63)
CIE-LCH	lch(38.71, 71.01, 35.90°)
OKLab	oklab(49.39% 0.1638 0.0866)
OKLCH	oklch(49.39% 0.185 27.9)
XYZ	xyz(19.1946, 10.4920, 1.9916)
Luminance	0.1049 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31C1A #1AB1B3

analogous

#B31A65 #B31C1A #B3681A

triadic

#B31C1A #1AB31C #1C1AB3

tetradic

#B31C1A #65B31A #1AB1B3 #681AB3

square

#B31C1A #65B31A #1AB1B3 #681AB3

split-complementary

#B31C1A #1AB368 #1A65B3

monochromatic

#480B0A #7E1412 #B31C1A #E02C2A #E86160

Accessibility & contrast

On white

6.78

#B31C1A on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#B31C1A on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31C1A

6.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31C1A	#FFFFFF	#000000	##FFFFFF
##B31C1A	1.00	6.78	3.10	6.78
#FFFFFF	6.78	1.00	21.00	1.00
#000000	3.10	21.00	1.00	21.00
##FFFFFF	6.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F4617

Deuteranopia (green-blind)

#746710

Tritanopia (blue-blind)

#C6001E

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31c1a;
/* rgb */ color: rgb(179, 28, 26);
/* oklch */ color: oklch(49.4% 0.185 27.9);

Tailwind

colors: {
  custom: {
    50: '#d46a59',
    500: '#b31c1a',
    950: '#000000',
  },
}

SCSS

$custom: #b31c1a;
$custom-light: #d46a59;
$custom-dark: #000000;

JSON

{
  "hex": "#b31c1a",
  "rgb": {
    "r": 179,
    "g": 28,
    "b": 26
  },
  "hsl": {
    "h": 0.784,
    "s": 74.634,
    "l": 40.196
  },
  "oklch": {
    "l": 0.49389,
    "c": 0.18524,
    "h": 27.9
  },
  "luminance": 0.10489
}

Semantic roles & 50–950 ramp

primary

#B31C1A

secondary

#5DCBCC

accent

#EFF137

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160703

muted

#847A78

Preview Lab

Preview with #B31C1A

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

Preview Lab → · Contrast checker → · Palette generator →