#B31B1A#B31B1A

#B31B1A is a mid, vivid red. Relative luminance 0.104; OKLCH L 49.3% C 0.186 H 27.7°. Best body text is #FFFFFF at 6.80:1 contrast (WCAG AA passes).

Color values

HEX	#B31B1A
RGB	rgb(179, 27, 26)
HSL	hsl(0, 75%, 40%)
HSV	hsv(0, 85%, 70%)
CMYK	cmyk(0%, 84.9%, 85.5%, 29.8%)
CIE-LAB	lab(38.63, 57.75, 41.56)
CIE-LCH	lch(38.63, 71.15, 35.74°)
OKLab	oklab(49.33% 0.1645 0.0865)
OKLCH	oklch(49.33% 0.186 27.7)
XYZ	xyz(19.1712, 10.4454, 1.9838)
Luminance	0.1044 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31B1A #1AB2B3

analogous

#B31A66 #B31B1A #B3671A

triadic

#B31B1A #1AB31B #1B1AB3

tetradic

#B31B1A #66B31A #1AB2B3 #671AB3

square

#B31B1A #66B31A #1AB2B3 #671AB3

split-complementary

#B31B1A #1AB367 #1A66B3

monochromatic

#480B0A #7E1312 #B31B1A #E02B2A #E86060

Accessibility & contrast

On white

6.80

#B31B1A on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.09

#B31B1A on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31B1A

6.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31B1A	#FFFFFF	#000000	##FFFFFF
##B31B1A	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)

#4F4617

Deuteranopia (green-blind)

#736610

Tritanopia (blue-blind)

#C6001E

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31b1a;
/* rgb */ color: rgb(179, 27, 26);
/* oklch */ color: oklch(49.3% 0.186 27.7);

Tailwind

colors: {
  custom: {
    50: '#d46a58',
    500: '#b31b1a',
    950: '#000000',
  },
}

SCSS

$custom: #b31b1a;
$custom-light: #d46a58;
$custom-dark: #000000;

JSON

{
  "hex": "#b31b1a",
  "rgb": {
    "r": 179,
    "g": 27,
    "b": 26
  },
  "hsl": {
    "h": 0.392,
    "s": 74.634,
    "l": 40.196
  },
  "oklch": {
    "l": 0.49329,
    "c": 0.18582,
    "h": 27.7
  },
  "luminance": 0.10442
}

Semantic roles & 50–950 ramp

primary

#B31B1A

secondary

#5DCBCC

accent

#F0F137

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160703

muted

#847A78

Preview Lab

Preview with #B31B1A

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

Preview Lab → · Contrast checker → · Palette generator →