#B31A1B#B31A1B

#B31A1B is a mid, vivid red. Relative luminance 0.104; OKLCH L 49.3% C 0.186 H 27.3°. Best body text is #FFFFFF at 6.82:1 contrast (WCAG AA passes).

Color values

HEX	#B31A1B
RGB	rgb(179, 26, 27)
HSL	hsl(360, 75%, 40%)
HSV	hsv(360, 85%, 70%)
CMYK	cmyk(0%, 85.5%, 84.9%, 29.8%)
CIE-LAB	lab(38.56, 58.00, 40.98)
CIE-LCH	lch(38.56, 71.02, 35.24°)
OKLab	oklab(49.28% 0.1654 0.0856)
OKLCH	oklch(49.28% 0.186 27.3)
XYZ	xyz(19.1601, 10.4048, 2.0362)
Luminance	0.1040 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31A1B #1AB3B2

analogous

#B31A67 #B31A1B #B3661A

triadic

#B31A1B #1BB31A #1A1BB3

tetradic

#B31A1B #67B31A #1AB3B2 #661AB3

square

#B31A1B #67B31A #1AB3B2 #661AB3

split-complementary

#B31A1B #1AB366 #1A67B3

monochromatic

#480A0B #7E1213 #B31A1B #E02A2B #E86060

Accessibility & contrast

On white

6.82

#B31A1B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.08

#B31A1B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31A1B

6.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31A1B	#FFFFFF	#000000	##FFFFFF
##B31A1B	1.00	6.82	3.08	6.82
#FFFFFF	6.82	1.00	21.00	1.00
#000000	3.08	21.00	1.00	21.00
##FFFFFF	6.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F4618

Deuteranopia (green-blind)

#736611

Tritanopia (blue-blind)

#C6001D

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31a1b;
/* rgb */ color: rgb(179, 26, 27);
/* oklch */ color: oklch(49.3% 0.186 27.3);

Tailwind

colors: {
  custom: {
    50: '#d46959',
    500: '#b31a1b',
    950: '#000000',
  },
}

SCSS

$custom: #b31a1b;
$custom-light: #d46959;
$custom-dark: #000000;

JSON

{
  "hex": "#b31a1b",
  "rgb": {
    "r": 179,
    "g": 26,
    "b": 27
  },
  "hsl": {
    "h": 359.608,
    "s": 74.634,
    "l": 40.196
  },
  "oklch": {
    "l": 0.49279,
    "c": 0.18626,
    "h": 27.3
  },
  "luminance": 0.10402
}

Semantic roles & 50–950 ramp

primary

#B31A1B

secondary

#5DCCCB

accent

#F1F037

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160703

muted

#847A78

Preview Lab

Preview with #B31A1B

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

Preview Lab → · Contrast checker → · Palette generator →