#B4311C#B4311C

#B4311C is a mid, vivid red. Relative luminance 0.120; OKLCH L 51.3% C 0.171 H 31.9°. Best body text is #FFFFFF at 6.18:1 contrast (WCAG AA passes).

Color values

HEX	#B4311C
RGB	rgb(180, 49, 28)
HSL	hsl(8, 73%, 41%)
HSV	hsv(8, 84%, 71%)
CMYK	cmyk(0%, 72.8%, 84.4%, 29.4%)
CIE-LAB	lab(41.20, 51.52, 42.91)
CIE-LCH	lch(41.20, 67.05, 39.79°)
OKLab	oklab(51.28% 0.1453 0.0903)
OKLCH	oklch(51.28% 0.171 31.9)
XYZ	xyz(20.1327, 11.9869, 2.3520)
Luminance	0.1198 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B4311C #1C9FB4

analogous

#B41C53 #B4311C #B47D1C

triadic

#B4311C #1CB431 #311CB4

tetradic

#B4311C #53B41C #1C9FB4 #7D1CB4

square

#B4311C #53B41C #1C9FB4 #7D1CB4

split-complementary

#B4311C #1CB47D #1C53B4

monochromatic

#4A140C #7F2314 #B4311C #DF472F #E77664

Accessibility & contrast

On white

6.18

#B4311C on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.40

#B4311C on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B4311C

6.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B4311C	#FFFFFF	#000000	##FFFFFF
##B4311C	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)

#594F18

Deuteranopia (green-blind)

#796C14

Tritanopia (blue-blind)

#C7002E

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #b4311c;
/* rgb */ color: rgb(180, 49, 28);
/* oklch */ color: oklch(51.3% 0.171 31.9);

Tailwind

colors: {
  custom: {
    50: '#d4725b',
    500: '#b4311c',
    950: '#000000',
  },
}

SCSS

$custom: #b4311c;
$custom-light: #d4725b;
$custom-dark: #000000;

JSON

{
  "hex": "#b4311c",
  "rgb": {
    "r": 180,
    "g": 49,
    "b": 28
  },
  "hsl": {
    "h": 8.289,
    "s": 73.077,
    "l": 40.784
  },
  "oklch": {
    "l": 0.51279,
    "c": 0.17102,
    "h": 31.9
  },
  "luminance": 0.11984
}

Semantic roles & 50–950 ramp

primary

#B4311C

secondary

#60BDCC

accent

#D6F038

background

#FEF7F5

surface

#FCEDE9

border

#D5C8C5

text

#160804

muted

#847B79

Preview Lab

Preview with #B4311C

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

Preview Lab → · Contrast checker → · Palette generator →