#B31C1D#B31C1D

#B31C1D is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.4% C 0.185 H 27.2°. Best body text is #FFFFFF at 6.77:1 contrast (WCAG AA passes).

Color values

HEX	#B31C1D
RGB	rgb(179, 28, 29)
HSL	hsl(360, 73%, 41%)
HSV	hsv(360, 84%, 70%)
CMYK	cmyk(0%, 84.4%, 83.8%, 29.8%)
CIE-LAB	lab(38.74, 57.60, 40.09)
CIE-LCH	lch(38.74, 70.17, 34.84°)
OKLab	oklab(49.42% 0.1645 0.0844)
OKLCH	oklch(49.42% 0.185 27.2)
XYZ	xyz(19.2299, 10.5061, 2.1775)
Luminance	0.1050 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31C1D #1CB3B2

analogous

#B31C68 #B31C1D #B3671C

triadic

#B31C1D #1DB31C #1C1DB3

tetradic

#B31C1D #68B31C #1CB3B2 #671CB3

square

#B31C1D #68B31C #1CB3B2 #671CB3

split-complementary

#B31C1D #1CB367 #1C68B3

monochromatic

#490B0C #7E1414 #B31C1D #DE2E2F #E76364

Accessibility & contrast

On white

6.77

#B31C1D on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#B31C1D on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31C1D

6.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31C1D	#FFFFFF	#000000	##FFFFFF
##B31C1D	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)

#4F461A

Deuteranopia (green-blind)

#736714

Tritanopia (blue-blind)

#C6001F

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31c1d;
/* rgb */ color: rgb(179, 28, 29);
/* oklch */ color: oklch(49.4% 0.185 27.2);

Tailwind

colors: {
  custom: {
    50: '#d46a5a',
    500: '#b31c1d',
    950: '#000000',
  },
}

SCSS

$custom: #b31c1d;
$custom-light: #d46a5a;
$custom-dark: #000000;

JSON

{
  "hex": "#b31c1d",
  "rgb": {
    "r": 179,
    "g": 28,
    "b": 29
  },
  "hsl": {
    "h": 359.603,
    "s": 72.947,
    "l": 40.588
  },
  "oklch": {
    "l": 0.49415,
    "c": 0.18493,
    "h": 27.2
  },
  "luminance": 0.10503
}

Semantic roles & 50–950 ramp

primary

#B31C1D

secondary

#5FCBCB

accent

#F0EE38

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31C1D

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

Preview Lab → · Contrast checker → · Palette generator →