#B3311F#B3311F

#B3311F is a mid, vivid red. Relative luminance 0.119; OKLCH L 51.1% C 0.170 H 31.1°. Best body text is #FFFFFF at 6.22:1 contrast (WCAG AA passes).

Color values

HEX	#B3311F
RGB	rgb(179, 49, 31)
HSL	hsl(7, 70%, 41%)
HSV	hsv(7, 83%, 70%)
CMYK	cmyk(0%, 72.6%, 82.7%, 29.8%)
CIE-LAB	lab(41.03, 51.28, 41.18)
CIE-LCH	lch(41.03, 65.77, 38.77°)
OKLab	oklab(51.13% 0.1451 0.0877)
OKLCH	oklch(51.13% 0.17 31.1)
XYZ	xyz(19.9384, 11.8824, 2.5397)
Luminance	0.1188 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B3311F #1FA1B3

analogous

#B31F57 #B3311F #B37B1F

triadic

#B3311F #1FB331 #311FB3

tetradic

#B3311F #57B31F #1FA1B3 #7B1FB3

square

#B3311F #57B31F #1FA1B3 #7B1FB3

split-complementary

#B3311F #1FB37B #1F57B3

monochromatic

#4B140D #7F2316 #B3311F #DC4833 #E57768

Accessibility & contrast

On white

6.22

#B3311F on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.38

#B3311F on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B3311F

6.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B3311F	#FFFFFF	#000000	##FFFFFF
##B3311F	1.00	6.22	3.38	6.22
#FFFFFF	6.22	1.00	21.00	1.00
#000000	3.38	21.00	1.00	21.00
##FFFFFF	6.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#584E1B

Deuteranopia (green-blind)

#786B18

Tritanopia (blue-blind)

#C5002E

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #b3311f;
/* rgb */ color: rgb(179, 49, 31);
/* oklch */ color: oklch(51.1% 0.170 31.1);

Tailwind

colors: {
  custom: {
    50: '#d3725d',
    500: '#b3311f',
    950: '#000000',
  },
}

SCSS

$custom: #b3311f;
$custom-light: #d3725d;
$custom-dark: #000000;

JSON

{
  "hex": "#b3311f",
  "rgb": {
    "r": 179,
    "g": 49,
    "b": 31
  },
  "hsl": {
    "h": 7.297,
    "s": 70.476,
    "l": 41.176
  },
  "oklch": {
    "l": 0.51127,
    "c": 0.16956,
    "h": 31.1
  },
  "luminance": 0.11879
}

Semantic roles & 50–950 ramp

primary

#B3311F

secondary

#64BECA

accent

#D8ED3B

background

#FEF7F5

surface

#FCEDE9

border

#D5C8C5

text

#160804

muted

#847B79

Preview Lab

Preview with #B3311F

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

Preview Lab → · Contrast checker → · Palette generator →