#B5312B#B5312B

#B5312B is a mid, vivid red. Relative luminance 0.122; OKLCH L 51.6% C 0.170 H 27.5°. Best body text is #FFFFFF at 6.11:1 contrast (WCAG AA passes).

Color values

HEX	#B5312B
RGB	rgb(181, 49, 43)
HSL	hsl(3, 62%, 44%)
HSV	hsv(3, 76%, 71%)
CMYK	cmyk(0%, 72.9%, 76.2%, 29%)
CIE-LAB	lab(41.53, 52.33, 35.26)
CIE-LCH	lch(41.53, 63.11, 33.97°)
OKLab	oklab(51.61% 0.1506 0.0784)
OKLCH	oklch(51.61% 0.17 27.5)
XYZ	xyz(20.5928, 12.1980, 3.5552)
Luminance	0.1220 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B5312B #2BAFB5

analogous

#B52B6A #B5312B #B5762B

triadic

#B5312B #2BB531 #312BB5

tetradic

#B5312B #6AB52B #2BAFB5 #762BB5

square

#B5312B #6AB52B #2BAFB5 #762BB5

split-complementary

#B5312B #2BB576 #2B6AB5

monochromatic

#521614 #84241F #B5312B #D44F49 #E07F7B

Accessibility & contrast

On white

6.11

#B5312B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.44

#B5312B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B5312B

6.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B5312B	#FFFFFF	#000000	##FFFFFF
##B5312B	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)

#585029

Deuteranopia (green-blind)

#796C26

Tritanopia (blue-blind)

#C70031

Achromatopsia (no color)

#626262

Design tokens & code

CSS

--color: #b5312b;
/* rgb */ color: rgb(181, 49, 43);
/* oklch */ color: oklch(51.6% 0.170 27.5);

Tailwind

colors: {
  custom: {
    50: '#d47365',
    500: '#b5312b',
    950: '#000000',
  },
}

SCSS

$custom: #b5312b;
$custom-light: #d47365;
$custom-dark: #000000;

JSON

{
  "hex": "#b5312b",
  "rgb": {
    "r": 181,
    "g": 49,
    "b": 43
  },
  "hsl": {
    "h": 2.609,
    "s": 61.607,
    "l": 43.922
  },
  "oklch": {
    "l": 0.51608,
    "c": 0.16978,
    "h": 27.5
  },
  "luminance": 0.12195
}

Semantic roles & 50–950 ramp

primary

#B5312B

secondary

#74C4C8

accent

#DEE543

background

#FEF7F6

surface

#FCEDEB

border

#D5C8C6

text

#160905

muted

#847B7A

Preview Lab

Preview with #B5312B

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

Preview Lab → · Contrast checker → · Palette generator →