#B31C1C#B31C1C

#B31C1C is a mid, vivid red. Relative luminance 0.105; OKLCH L 49.4% C 0.185 H 27.4°. Best body text is #FFFFFF at 6.78:1 contrast (WCAG AA passes).

Color values

HEX	#B31C1C
RGB	rgb(179, 28, 28)
HSL	hsl(0, 73%, 41%)
HSV	hsv(0, 84%, 70%)
CMYK	cmyk(0%, 84.4%, 84.4%, 29.8%)
CIE-LAB	lab(38.73, 57.57, 40.61)
CIE-LCH	lch(38.73, 70.45, 35.20°)
OKLab	oklab(49.41% 0.1643 0.0852)
OKLCH	oklch(49.41% 0.185 27.4)
XYZ	xyz(19.2177, 10.5013, 2.1135)
Luminance	0.1050 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31C1C #1CB3B3

analogous

#B31C67 #B31C1C #B3671C

triadic

#B31C1C #1CB31C #1C1CB3

tetradic

#B31C1C #67B31C #1CB3B3 #671CB3

square

#B31C1C #67B31C #1CB3B3 #671CB3

split-complementary

#B31C1C #1CB367 #1C67B3

monochromatic

#490B0B #7E1414 #B31C1C #DE2E2E #E76363

Accessibility & contrast

On white

6.78

#B31C1C on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.10

#B31C1C on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31C1C

6.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31C1C	#FFFFFF	#000000	##FFFFFF
##B31C1C	1.00	6.78	3.10	6.78
#FFFFFF	6.78	1.00	21.00	1.00
#000000	3.10	21.00	1.00	21.00
##FFFFFF	6.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F4619

Deuteranopia (green-blind)

#736713

Tritanopia (blue-blind)

#C6001F

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31c1c;
/* rgb */ color: rgb(179, 28, 28);
/* oklch */ color: oklch(49.4% 0.185 27.4);

Tailwind

colors: {
  custom: {
    50: '#d46a5a',
    500: '#b31c1c',
    950: '#000000',
  },
}

SCSS

$custom: #b31c1c;
$custom-light: #d46a5a;
$custom-dark: #000000;

JSON

{
  "hex": "#b31c1c",
  "rgb": {
    "r": 179,
    "g": 28,
    "b": 28
  },
  "hsl": {
    "h": 0,
    "s": 72.947,
    "l": 40.588
  },
  "oklch": {
    "l": 0.49406,
    "c": 0.18504,
    "h": 27.4
  },
  "luminance": 0.10498
}

Semantic roles & 50–950 ramp

primary

#B31C1C

secondary

#5FCBCB

accent

#F0F038

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31C1C

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

Preview Lab → · Contrast checker → · Palette generator →