#B31C1F#B31C1F

#B31C1F is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.4% C 0.185 H 26.6°. Best body text is #FFFFFF at 6.77:1 contrast (WCAG AA passes).

Color values

HEX	#B31C1F
RGB	rgb(179, 28, 31)
HSL	hsl(359, 73%, 41%)
HSV	hsv(359, 84%, 70%)
CMYK	cmyk(0%, 84.4%, 82.7%, 29.8%)
CIE-LAB	lab(38.75, 57.65, 39.02)
CIE-LCH	lch(38.75, 69.61, 34.09°)
OKLab	oklab(49.43% 0.1651 0.0829)
OKLCH	oklch(49.43% 0.185 26.6)
XYZ	xyz(19.2554, 10.5163, 2.3121)
Luminance	0.1051 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31C1F #1CB3B0

analogous

#B31C6A #B31C1F #B3641C

triadic

#B31C1F #1FB31C #1C1FB3

tetradic

#B31C1F #6AB31C #1CB3B0 #641CB3

square

#B31C1F #6AB31C #1CB3B0 #641CB3

split-complementary

#B31C1F #1CB364 #1C6AB3

monochromatic

#490B0D #7E1416 #B31C1F #DE2E31 #E76365

Accessibility & contrast

On white

6.77

#B31C1F on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#B31C1F on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31C1F

6.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31C1F	#FFFFFF	#000000	##FFFFFF
##B31C1F	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)

#4F461D

Deuteranopia (green-blind)

#736717

Tritanopia (blue-blind)

#C60020

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31c1f;
/* rgb */ color: rgb(179, 28, 31);
/* oklch */ color: oklch(49.4% 0.185 26.6);

Tailwind

colors: {
  custom: {
    50: '#d46a5c',
    500: '#b31c1f',
    950: '#000000',
  },
}

SCSS

$custom: #b31c1f;
$custom-light: #d46a5c;
$custom-dark: #000000;

JSON

{
  "hex": "#b31c1f",
  "rgb": {
    "r": 179,
    "g": 28,
    "b": 31
  },
  "hsl": {
    "h": 358.808,
    "s": 72.947,
    "l": 40.588
  },
  "oklch": {
    "l": 0.49434,
    "c": 0.18474,
    "h": 26.6
  },
  "luminance": 0.10513
}

Semantic roles & 50–950 ramp

primary

#B31C1F

secondary

#5FCBC9

accent

#F0EC38

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31C1F

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

Preview Lab → · Contrast checker → · Palette generator →