#B31B2A#B31B2A

#B31B2A is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.5% C 0.184 H 23.2°. Best body text is #FFFFFF at 6.76:1 contrast (WCAG AA passes).

Color values

HEX	#B31B2A
RGB	rgb(179, 27, 42)
HSL	hsl(354, 74%, 40%)
HSV	hsv(354, 85%, 70%)
CMYK	cmyk(0%, 84.9%, 76.5%, 29.8%)
CIE-LAB	lab(38.79, 58.24, 32.73)
CIE-LCH	lch(38.79, 66.80, 29.34°)
OKLab	oklab(49.5% 0.1693 0.0727)
OKLCH	oklch(49.5% 0.184 23.2)
XYZ	xyz(19.4026, 10.5379, 3.2025)
Luminance	0.1053 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31B2A #1BB3A4

analogous

#B31B76 #B31B2A #B3581B

triadic

#B31B2A #2AB31B #1B2AB3

tetradic

#B31B2A #76B31B #1BB3A4 #581BB3

square

#B31B2A #76B31B #1BB3A4 #581BB3

split-complementary

#B31B2A #1BB358 #1B76B3

monochromatic

#490B11 #7E131E #B31B2A #DF2C3E #E7616E

Accessibility & contrast

On white

6.76

#B31B2A on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.11

#B31B2A on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31B2A

6.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31B2A	#FFFFFF	#000000	##FFFFFF
##B31B2A	1.00	6.76	3.11	6.76
#FFFFFF	6.76	1.00	21.00	1.00
#000000	3.11	21.00	1.00	21.00
##FFFFFF	6.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4E4729

Deuteranopia (green-blind)

#726724

Tritanopia (blue-blind)

#C50023

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31b2a;
/* rgb */ color: rgb(179, 27, 42);
/* oklch */ color: oklch(49.5% 0.184 23.2);

Tailwind

colors: {
  custom: {
    50: '#d36a64',
    500: '#b31b2a',
    950: '#000000',
  },
}

SCSS

$custom: #b31b2a;
$custom-light: #d36a64;
$custom-dark: #000000;

JSON

{
  "hex": "#b31b2a",
  "rgb": {
    "r": 179,
    "g": 27,
    "b": 42
  },
  "hsl": {
    "h": 354.079,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.49499,
    "c": 0.18428,
    "h": 23.2
  },
  "luminance": 0.10535
}

Semantic roles & 50–950 ramp

primary

#B31B2A

secondary

#5ECCC1

accent

#F0DE37

background

#FEF6F5

surface

#FCECEA

border

#D5C7C6

text

#160705

muted

#847A79

Preview Lab

Preview with #B31B2A

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

Preview Lab → · Contrast checker → · Palette generator →