#31040B#31040B

#31040B is a very dark, moderate red. Relative luminance 0.008; OKLCH L 20.6% C 0.072 H 16.8°. Best body text is #FFFFFF at 18.22:1 contrast (WCAG AA passes).

Color values

HEX	#31040B
RGB	rgb(49, 4, 11)
HSL	hsl(351, 85%, 10%)
HSV	hsv(351, 92%, 19%)
CMYK	cmyk(0%, 91.8%, 77.6%, 80.8%)
CIE-LAB	lab(6.90, 22.98, 6.30)
CIE-LCH	lch(6.90, 23.83, 15.32°)
OKLab	oklab(20.61% 0.0692 0.0209)
OKLCH	oklch(20.61% 0.072 16.8)
XYZ	xyz(1.3706, 0.7642, 0.3919)
Luminance	0.0076 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#31040B #04312A

analogous

#310421 #31040B #311304

triadic

#31040B #0B3104 #040B31

tetradic

#31040B #213104 #04312A #130431

square

#31040B #213104 #04312A #130431

split-complementary

#31040B #043113 #042131

monochromatic

#1C0206 #1C0206 #31040B #6A0918 #A20D24

Accessibility & contrast

On white

18.22

#31040B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.15

#31040B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #31040B

18.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##31040B	#FFFFFF	#000000	##FFFFFF
##31040B	1.00	18.22	1.15	18.22
#FFFFFF	18.22	1.00	21.00	1.00
#000000	1.15	21.00	1.00	21.00
##FFFFFF	18.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#100F0B

Deuteranopia (green-blind)

#1C190A

Tritanopia (blue-blind)

#370007

Achromatopsia (no color)

#151515

Design tokens & code

CSS

--color: #31040b;
/* rgb */ color: rgb(49, 4, 11);
/* oklch */ color: oklch(20.6% 0.072 16.8);

Tailwind

colors: {
  custom: {
    50: '#6d484b',
    500: '#31040b',
    950: '#000000',
  },
}

SCSS

$custom: #31040b;
$custom-light: #6d484b;
$custom-dark: #000000;

JSON

{
  "hex": "#31040b",
  "rgb": {
    "r": 49,
    "g": 4,
    "b": 11
  },
  "hsl": {
    "h": 350.667,
    "s": 84.906,
    "l": 10.392
  },
  "oklch": {
    "l": 0.20606,
    "c": 0.07232,
    "h": 16.8
  },
  "luminance": 0.00764
}

Semantic roles & 50–950 ramp

primary

#31040B

secondary

#1D7366

accent

#FBDB2D

background

#F6F4F4

surface

#ECE7E7

border

#C7C3C3

text

#070101

muted

#7A7777

Preview Lab

Preview with #31040B

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

Preview Lab → · Contrast checker → · Palette generator →