#B31F1A#B31F1A

#B31F1A is a mid, vivid red. Relative luminance 0.106; OKLCH L 49.6% C 0.183 H 28.4°. Best body text is #FFFFFF at 6.71:1 contrast (WCAG AA passes).

Color values

HEX	#B31F1A
RGB	rgb(179, 31, 26)
HSL	hsl(2, 75%, 40%)
HSV	hsv(2, 85%, 70%)
CMYK	cmyk(0%, 82.7%, 85.5%, 29.8%)
CIE-LAB	lab(38.97, 56.79, 41.86)
CIE-LCH	lch(38.97, 70.55, 36.40°)
OKLab	oklab(49.58% 0.1615 0.0871)
OKLCH	oklch(49.58% 0.183 28.4)
XYZ	xyz(19.2693, 10.6415, 2.0165)
Luminance	0.1064 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31F1A #1AAEB3

analogous

#B31A61 #B31F1A #B36C1A

triadic

#B31F1A #1AB31F #1F1AB3

tetradic

#B31F1A #61B31A #1AAEB3 #6C1AB3

square

#B31F1A #61B31A #1AAEB3 #6C1AB3

split-complementary

#B31F1A #1AB36C #1A61B3

monochromatic

#480C0A #7E1612 #B31F1A #E0302A #E86460

Accessibility & contrast

On white

6.71

#B31F1A on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.13

#B31F1A on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31F1A

6.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31F1A	#FFFFFF	#000000	##FFFFFF
##B31F1A	1.00	6.71	3.13	6.71
#FFFFFF	6.71	1.00	21.00	1.00
#000000	3.13	21.00	1.00	21.00
##FFFFFF	6.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#504717

Deuteranopia (green-blind)

#746710

Tritanopia (blue-blind)

#C60020

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #b31f1a;
/* rgb */ color: rgb(179, 31, 26);
/* oklch */ color: oklch(49.6% 0.183 28.4);

Tailwind

colors: {
  custom: {
    50: '#d46b59',
    500: '#b31f1a',
    950: '#000000',
  },
}

SCSS

$custom: #b31f1a;
$custom-light: #d46b59;
$custom-dark: #000000;

JSON

{
  "hex": "#b31f1a",
  "rgb": {
    "r": 179,
    "g": 31,
    "b": 26
  },
  "hsl": {
    "h": 1.961,
    "s": 74.634,
    "l": 40.196
  },
  "oklch": {
    "l": 0.49581,
    "c": 0.18347,
    "h": 28.4
  },
  "luminance": 0.10638
}

Semantic roles & 50–950 ramp

primary

#B31F1A

secondary

#5DC8CC

accent

#EBF137

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160803

muted

#847A78

Preview Lab

Preview with #B31F1A

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

Preview Lab → · Contrast checker → · Palette generator →