#B31F1B#B31F1B

#B31F1B is a mid, vivid red. Relative luminance 0.106; OKLCH L 49.6% C 0.183 H 28.1°. Best body text is #FFFFFF at 6.71:1 contrast (WCAG AA passes).

Color values

HEX	#B31F1B
RGB	rgb(179, 31, 27)
HSL	hsl(2, 74%, 40%)
HSV	hsv(2, 85%, 70%)
CMYK	cmyk(0%, 82.7%, 84.9%, 29.8%)
CIE-LAB	lab(38.98, 56.81, 41.36)
CIE-LCH	lch(38.98, 70.27, 36.05°)
OKLab	oklab(49.59% 0.1617 0.0864)
OKLCH	oklch(49.59% 0.183 28.1)
XYZ	xyz(19.2807, 10.6460, 2.0764)
Luminance	0.1064 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31F1B #1BAFB3

analogous

#B31B63 #B31F1B #B36B1B

triadic

#B31F1B #1BB31F #1F1BB3

tetradic

#B31F1B #63B31B #1BAFB3 #6B1BB3

square

#B31F1B #63B31B #1BAFB3 #6B1BB3

split-complementary

#B31F1B #1BB36B #1B63B3

monochromatic

#490D0B #7E1613 #B31F1B #DF312C #E76561

Accessibility & contrast

On white

6.71

#B31F1B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.13

#B31F1B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31F1B

6.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31F1B	#FFFFFF	#000000	##FFFFFF
##B31F1B	1.00	6.71	3.13	6.71
#FFFFFF	6.71	1.00	21.00	1.00
#000000	3.13	21.00	1.00	21.00
##FFFFFF	6.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#504718

Deuteranopia (green-blind)

#746712

Tritanopia (blue-blind)

#C60021

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #b31f1b;
/* rgb */ color: rgb(179, 31, 27);
/* oklch */ color: oklch(49.6% 0.183 28.1);

Tailwind

colors: {
  custom: {
    50: '#d46b59',
    500: '#b31f1b',
    950: '#000000',
  },
}

SCSS

$custom: #b31f1b;
$custom-light: #d46b59;
$custom-dark: #000000;

JSON

{
  "hex": "#b31f1b",
  "rgb": {
    "r": 179,
    "g": 31,
    "b": 27
  },
  "hsl": {
    "h": 1.579,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.49589,
    "c": 0.18336,
    "h": 28.1
  },
  "luminance": 0.10643
}

Semantic roles & 50–950 ramp

primary

#B31F1B

secondary

#5EC9CC

accent

#ECF037

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160804

muted

#847A79

Preview Lab

Preview with #B31F1B

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

Preview Lab → · Contrast checker → · Palette generator →