#B4311B#B4311B

#B4311B is a mid, vivid red. Relative luminance 0.120; OKLCH L 51.3% C 0.171 H 32.1°. Best body text is #FFFFFF at 6.18:1 contrast (WCAG AA passes).

Color values

HEX	#B4311B
RGB	rgb(180, 49, 27)
HSL	hsl(9, 74%, 41%)
HSV	hsv(9, 85%, 71%)
CMYK	cmyk(0%, 72.8%, 85%, 29.4%)
CIE-LAB	lab(41.19, 51.49, 43.39)
CIE-LCH	lch(41.19, 67.34, 40.12°)
OKLab	oklab(51.27% 0.145 0.091)
OKLCH	oklch(51.27% 0.171 32.1)
XYZ	xyz(20.1210, 11.9822, 2.2900)
Luminance	0.1198 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B4311B #1B9EB4

analogous

#B41B52 #B4311B #B47D1B

triadic

#B4311B #1BB431 #311BB4

tetradic

#B4311B #52B41B #1B9EB4 #7D1BB4

square

#B4311B #52B41B #1B9EB4 #7D1BB4

split-complementary

#B4311B #1BB47D #1B52B4

monochromatic

#4A140B #7F2313 #B4311B #DF462D #E77562

Accessibility & contrast

On white

6.18

#B4311B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.40

#B4311B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B4311B

6.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B4311B	#FFFFFF	#000000	##FFFFFF
##B4311B	1.00	6.18	3.40	6.18
#FFFFFF	6.18	1.00	21.00	1.00
#000000	3.40	21.00	1.00	21.00
##FFFFFF	6.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#594F16

Deuteranopia (green-blind)

#796C13

Tritanopia (blue-blind)

#C7002D

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #b4311b;
/* rgb */ color: rgb(180, 49, 27);
/* oklch */ color: oklch(51.3% 0.171 32.1);

Tailwind

colors: {
  custom: {
    50: '#d4725a',
    500: '#b4311b',
    950: '#000000',
  },
}

SCSS

$custom: #b4311b;
$custom-light: #d4725a;
$custom-dark: #000000;

JSON

{
  "hex": "#b4311b",
  "rgb": {
    "r": 180,
    "g": 49,
    "b": 27
  },
  "hsl": {
    "h": 8.627,
    "s": 73.913,
    "l": 40.588
  },
  "oklch": {
    "l": 0.51271,
    "c": 0.17117,
    "h": 32.1
  },
  "luminance": 0.11979
}

Semantic roles & 50–950 ramp

primary

#B4311B

secondary

#5FBCCC

accent

#D6F137

background

#FEF7F5

surface

#FCEDE9

border

#D5C8C5

text

#160804

muted

#847B79

Preview Lab

Preview with #B4311B

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

Preview Lab → · Contrast checker → · Palette generator →