#B3311C#B3311C

#B3311C is a mid, vivid red. Relative luminance 0.119; OKLCH L 51.1% C 0.170 H 31.9°. Best body text is #FFFFFF at 6.23:1 contrast (WCAG AA passes).

Color values

HEX	#B3311C
RGB	rgb(179, 49, 28)
HSL	hsl(8, 73%, 41%)
HSV	hsv(8, 84%, 70%)
CMYK	cmyk(0%, 72.6%, 84.4%, 29.8%)
CIE-LAB	lab(41.00, 51.19, 42.67)
CIE-LCH	lch(41.00, 66.64, 39.81°)
OKLab	oklab(51.1% 0.1444 0.0898)
OKLCH	oklch(51.1% 0.17 31.9)
XYZ	xyz(19.9007, 11.8673, 2.3411)
Luminance	0.1186 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B3311C #1C9EB3

analogous

#B31C53 #B3311C #B37C1C

triadic

#B3311C #1CB331 #311CB3

tetradic

#B3311C #53B31C #1C9EB3 #7C1CB3

square

#B3311C #53B31C #1C9EB3 #7C1CB3

split-complementary

#B3311C #1CB37C #1C53B3

monochromatic

#49140B #7E2314 #B3311C #DE462E #E77563

Accessibility & contrast

On white

6.23

#B3311C on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.37

#B3311C on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B3311C

6.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B3311C	#FFFFFF	#000000	##FFFFFF
##B3311C	1.00	6.23	3.37	6.23
#FFFFFF	6.23	1.00	21.00	1.00
#000000	3.37	21.00	1.00	21.00
##FFFFFF	6.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#584E18

Deuteranopia (green-blind)

#786B14

Tritanopia (blue-blind)

#C6002E

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #b3311c;
/* rgb */ color: rgb(179, 49, 28);
/* oklch */ color: oklch(51.1% 0.170 31.9);

Tailwind

colors: {
  custom: {
    50: '#d3725b',
    500: '#b3311c',
    950: '#000000',
  },
}

SCSS

$custom: #b3311c;
$custom-light: #d3725b;
$custom-dark: #000000;

JSON

{
  "hex": "#b3311c",
  "rgb": {
    "r": 179,
    "g": 49,
    "b": 28
  },
  "hsl": {
    "h": 8.344,
    "s": 72.947,
    "l": 40.588
  },
  "oklch": {
    "l": 0.51101,
    "c": 0.17002,
    "h": 31.9
  },
  "luminance": 0.11864
}

Semantic roles & 50–950 ramp

primary

#B3311C

secondary

#5FBCCB

accent

#D6F038

background

#FEF7F5

surface

#FCEDE9

border

#D5C8C5

text

#160804

muted

#847B79

Preview Lab

Preview with #B3311C

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

Preview Lab → · Contrast checker → · Palette generator →