#B31A1C#B31A1C

#B31A1C is a mid, vivid red. Relative luminance 0.104; OKLCH L 49.3% C 0.186 H 27.1°. Best body text is #FFFFFF at 6.82:1 contrast (WCAG AA passes).

Color values

HEX	#B31A1C
RGB	rgb(179, 26, 28)
HSL	hsl(359, 75%, 40%)
HSV	hsv(359, 85%, 70%)
CMYK	cmyk(0%, 85.5%, 84.4%, 29.8%)
CIE-LAB	lab(38.57, 58.03, 40.46)
CIE-LCH	lch(38.57, 70.74, 34.89°)
OKLab	oklab(49.29% 0.1657 0.0848)
OKLCH	oklch(49.29% 0.186 27.1)
XYZ	xyz(19.1718, 10.4095, 2.0982)
Luminance	0.1041 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B31A1C #1AB3B1

analogous

#B31A68 #B31A1C #B3651A

triadic

#B31A1C #1CB31A #1A1CB3

tetradic

#B31A1C #68B31A #1AB3B1 #651AB3

square

#B31A1C #68B31A #1AB3B1 #651AB3

split-complementary

#B31A1C #1AB365 #1A68B3

monochromatic

#480A0B #7E1214 #B31A1C #E02A2C #E86061

Accessibility & contrast

On white

6.82

#B31A1C on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.08

#B31A1C on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B31A1C

6.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B31A1C	#FFFFFF	#000000	##FFFFFF
##B31A1C	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)

#4E4619

Deuteranopia (green-blind)

#736613

Tritanopia (blue-blind)

#C6001E

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #b31a1c;
/* rgb */ color: rgb(179, 26, 28);
/* oklch */ color: oklch(49.3% 0.186 27.1);

Tailwind

colors: {
  custom: {
    50: '#d4695a',
    500: '#b31a1c',
    950: '#000000',
  },
}

SCSS

$custom: #b31a1c;
$custom-light: #d4695a;
$custom-dark: #000000;

JSON

{
  "hex": "#b31a1c",
  "rgb": {
    "r": 179,
    "g": 26,
    "b": 28
  },
  "hsl": {
    "h": 359.216,
    "s": 74.634,
    "l": 40.196
  },
  "oklch": {
    "l": 0.49288,
    "c": 0.18616,
    "h": 27.1
  },
  "luminance": 0.10406
}

Semantic roles & 50–950 ramp

primary

#B31A1C

secondary

#5DCCCB

accent

#F1EF37

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160704

muted

#847A79

Preview Lab

Preview with #B31A1C

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

Preview Lab → · Contrast checker → · Palette generator →