#B3311A#B3311A

#B3311A is a mid, vivid red. Relative luminance 0.119; OKLCH L 51.1% C 0.170 H 32.4°. Best body text is #FFFFFF at 6.23:1 contrast (WCAG AA passes).

Color values

HEX	#B3311A
RGB	rgb(179, 49, 26)
HSL	hsl(9, 75%, 40%)
HSV	hsv(9, 85%, 70%)
CMYK	cmyk(0%, 72.6%, 85.5%, 29.8%)
CIE-LAB	lab(40.99, 51.14, 43.63)
CIE-LCH	lch(40.99, 67.22, 40.46°)
OKLab	oklab(51.09% 0.1439 0.0912)
OKLCH	oklch(51.09% 0.17 32.4)
XYZ	xyz(19.8776, 11.8580, 2.2193)
Luminance	0.1186 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B3311A #1A9CB3

analogous

#B31A4F #B3311A #B37E1A

triadic

#B3311A #1AB331 #311AB3

tetradic

#B3311A #4FB31A #1A9CB3 #7E1AB3

square

#B3311A #4FB31A #1A9CB3 #7E1AB3

split-complementary

#B3311A #1AB37E #1A4FB3

monochromatic

#48140A #7E2212 #B3311A #E0452A #E87460

Accessibility & contrast

On white

6.23

#B3311A on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.37

#B3311A on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B3311A

6.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B3311A	#FFFFFF	#000000	##FFFFFF
##B3311A	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)

#594E15

Deuteranopia (green-blind)

#796B12

Tritanopia (blue-blind)

#C6002D

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #b3311a;
/* rgb */ color: rgb(179, 49, 26);
/* oklch */ color: oklch(51.1% 0.170 32.4);

Tailwind

colors: {
  custom: {
    50: '#d3725a',
    500: '#b3311a',
    950: '#000000',
  },
}

SCSS

$custom: #b3311a;
$custom-light: #d3725a;
$custom-dark: #000000;

JSON

{
  "hex": "#b3311a",
  "rgb": {
    "r": 179,
    "g": 49,
    "b": 26
  },
  "hsl": {
    "h": 9.02,
    "s": 74.634,
    "l": 40.196
  },
  "oklch": {
    "l": 0.51086,
    "c": 0.17032,
    "h": 32.4
  },
  "luminance": 0.11855
}

Semantic roles & 50–950 ramp

primary

#B3311A

secondary

#5DBBCC

accent

#D5F137

background

#FEF7F5

surface

#FCEDE9

border

#D5C8C5

text

#160804

muted

#847B79

Preview Lab

Preview with #B3311A

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

Preview Lab → · Contrast checker → · Palette generator →