#B4231B#B4231B

#B4231B is a mid, vivid red. Relative luminance 0.110; OKLCH L 50.1% C 0.182 H 28.8°. Best body text is #FFFFFF at 6.57:1 contrast (WCAG AA passes).

Color values

HEX	#B4231B
RGB	rgb(180, 35, 27)
HSL	hsl(3, 74%, 41%)
HSV	hsv(3, 85%, 71%)
CMYK	cmyk(0%, 80.6%, 85%, 29.4%)
CIE-LAB	lab(39.56, 56.04, 41.95)
CIE-LCH	lch(39.56, 70.00, 36.82°)
OKLab	oklab(50.06% 0.1592 0.0877)
OKLCH	oklch(50.06% 0.182 28.8)
XYZ	xyz(19.6237, 10.9877, 2.1243)
Luminance	0.1098 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B4231B #1BACB4

analogous

#B41B60 #B4231B #B46F1B

triadic

#B4231B #1BB423 #231BB4

tetradic

#B4231B #60B41B #1BACB4 #6F1BB4

square

#B4231B #60B41B #1BACB4 #6F1BB4

split-complementary

#B4231B #1BB46F #1B60B4

monochromatic

#4A0E0B #7F1913 #B4231B #DF362D #E76962

Accessibility & contrast

On white

6.57

#B4231B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.20

#B4231B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B4231B

6.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B4231B	#FFFFFF	#000000	##FFFFFF
##B4231B	1.00	6.57	3.20	6.57
#FFFFFF	6.57	1.00	21.00	1.00
#000000	3.20	21.00	1.00	21.00
##FFFFFF	6.57	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#524918

Deuteranopia (green-blind)

#766812

Tritanopia (blue-blind)

#C70023

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #b4231b;
/* rgb */ color: rgb(180, 35, 27);
/* oklch */ color: oklch(50.1% 0.182 28.8);

Tailwind

colors: {
  custom: {
    50: '#d56c59',
    500: '#b4231b',
    950: '#000000',
  },
}

SCSS

$custom: #b4231b;
$custom-light: #d56c59;
$custom-dark: #000000;

JSON

{
  "hex": "#b4231b",
  "rgb": {
    "r": 180,
    "g": 35,
    "b": 27
  },
  "hsl": {
    "h": 3.137,
    "s": 73.913,
    "l": 40.588
  },
  "oklch": {
    "l": 0.50057,
    "c": 0.18171,
    "h": 28.8
  },
  "luminance": 0.10984
}

Semantic roles & 50–950 ramp

primary

#B4231B

secondary

#5FC6CC

accent

#E7F137

background

#FEF6F5

surface

#FDECE9

border

#D5C7C5

text

#160804

muted

#847A79

Preview Lab

Preview with #B4231B

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

Preview Lab → · Contrast checker → · Palette generator →