#B31B28#B31B28

#B31B28 is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.5% C 0.184 H 23.9°. Best body text is #FFFFFF at 6.77:1 contrast (WCAG AA passes).

Color values

HEX	#B31B28
RGB	rgb(179, 27, 40)
HSL	hsl(355, 74%, 40%)
HSV	hsv(355, 85%, 70%)
CMYK	cmyk(0%, 84.9%, 77.7%, 29.8%)
CIE-LAB	lab(38.77, 58.16, 33.89)
CIE-LCH	lch(38.77, 67.32, 30.23°)
OKLab	oklab(49.47% 0.1687 0.0747)
OKLCH	oklch(49.47% 0.184 23.9)
XYZ	xyz(19.3677, 10.5240, 3.0186)
Luminance	0.1052 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31B28 #1BB3A6

analogous

#B31B74 #B31B28 #B35A1B

triadic

#B31B28 #28B31B #1B28B3

tetradic

#B31B28 #74B31B #1BB3A6 #5A1BB3

square

#B31B28 #74B31B #1BB3A6 #5A1BB3

split-complementary

#B31B28 #1BB35A #1B74B3

monochromatic

#490B10 #7E131C #B31B28 #DF2C3B #E7616D

Accessibility & contrast

On white

6.77

#B31B28 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#B31B28 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31B28

6.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31B28	#FFFFFF	#000000	##FFFFFF
##B31B28	1.00	6.77	3.10	6.77
#FFFFFF	6.77	1.00	21.00	1.00
#000000	3.10	21.00	1.00	21.00
##FFFFFF	6.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4E4727

Deuteranopia (green-blind)

#736722

Tritanopia (blue-blind)

#C50022

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31b28;
/* rgb */ color: rgb(179, 27, 40);
/* oklch */ color: oklch(49.5% 0.184 23.9);

Tailwind

colors: {
  custom: {
    50: '#d36a62',
    500: '#b31b28',
    950: '#000000',
  },
}

SCSS

$custom: #b31b28;
$custom-light: #d36a62;
$custom-dark: #000000;

JSON

{
  "hex": "#b31b28",
  "rgb": {
    "r": 179,
    "g": 27,
    "b": 40
  },
  "hsl": {
    "h": 354.868,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.49473,
    "c": 0.18445,
    "h": 23.9
  },
  "luminance": 0.10521
}

Semantic roles & 50–950 ramp

primary

#B31B28

secondary

#5ECCC2

accent

#F0E137

background

#FEF6F5

surface

#FCECEA

border

#D5C7C6

text

#160705

muted

#847A79

Preview Lab

Preview with #B31B28

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

Preview Lab → · Contrast checker → · Palette generator →