#B5312A#B5312A

#B5312A is a mid, vivid red. Relative luminance 0.122; OKLCH L 51.6% C 0.170 H 27.8°. Best body text is #FFFFFF at 6.11:1 contrast (WCAG AA passes).

Color values

HEX	#B5312A
RGB	rgb(181, 49, 42)
HSL	hsl(3, 62%, 44%)
HSV	hsv(3, 77%, 71%)
CMYK	cmyk(0%, 72.9%, 76.8%, 29%)
CIE-LAB	lab(41.52, 52.30, 35.82)
CIE-LCH	lch(41.52, 63.39, 34.41°)
OKLab	oklab(51.6% 0.1503 0.0793)
OKLCH	oklch(51.6% 0.17 27.8)
XYZ	xyz(20.5747, 12.1907, 3.4597)
Luminance	0.1219 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B5312A #2AAEB5

analogous

#B52A68 #B5312A #B5762A

triadic

#B5312A #2AB531 #312AB5

tetradic

#B5312A #68B52A #2AAEB5 #762AB5

square

#B5312A #68B52A #2AAEB5 #762AB5

split-complementary

#B5312A #2AB576 #2A68B5

monochromatic

#521613 #83241E #B5312A #D44F48 #E07F79

Accessibility & contrast

On white

6.11

#B5312A on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.44

#B5312A on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B5312A

6.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B5312A	#FFFFFF	#000000	##FFFFFF
##B5312A	1.00	6.11	3.44	6.11
#FFFFFF	6.11	1.00	21.00	1.00
#000000	3.44	21.00	1.00	21.00
##FFFFFF	6.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#585028

Deuteranopia (green-blind)

#796C25

Tritanopia (blue-blind)

#C70031

Achromatopsia (no color)

#626262

Design tokens & code

CSS

--color: #b5312a;
/* rgb */ color: rgb(181, 49, 42);
/* oklch */ color: oklch(51.6% 0.170 27.8);

Tailwind

colors: {
  custom: {
    50: '#d47364',
    500: '#b5312a',
    950: '#000000',
  },
}

SCSS

$custom: #b5312a;
$custom-light: #d47364;
$custom-dark: #000000;

JSON

{
  "hex": "#b5312a",
  "rgb": {
    "r": 181,
    "g": 49,
    "b": 42
  },
  "hsl": {
    "h": 3.022,
    "s": 62.332,
    "l": 43.725
  },
  "oklch": {
    "l": 0.51596,
    "c": 0.16992,
    "h": 27.8
  },
  "luminance": 0.12188
}

Semantic roles & 50–950 ramp

primary

#B5312A

secondary

#73C4C8

accent

#DDE542

background

#FEF7F6

surface

#FCEDEB

border

#D5C8C6

text

#160905

muted

#847B7A

Preview Lab

Preview with #B5312A

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

Preview Lab → · Contrast checker → · Palette generator →