#31090B#31090B

#31090B is a very dark, moderate red. Relative luminance 0.009; OKLCH L 21.4% C 0.065 H 21.7°. Best body text is #FFFFFF at 17.88:1 contrast (WCAG AA passes).

Color values

HEX	#31090B
RGB	rgb(49, 9, 11)
HSL	hsl(357, 69%, 11%)
HSV	hsv(357, 82%, 19%)
CMYK	cmyk(0%, 81.6%, 77.6%, 80.8%)
CIE-LAB	lab(7.88, 20.34, 7.73)
CIE-LCH	lch(7.88, 21.76, 20.80°)
OKLab	oklab(21.38% 0.06 0.0239)
OKLCH	oklch(21.38% 0.065 21.7)
XYZ	xyz(1.4249, 0.8727, 0.4100)
Luminance	0.0087 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#31090B #09312F

analogous

#31091F #31090B #311B09

triadic

#31090B #0B3109 #090B31

tetradic

#31090B #1F3109 #09312F #1B0931

square

#31090B #1F3109 #09312F #1B0931

split-complementary

#31090B #09311B #091F31

monochromatic

#1A0506 #1A0506 #31090B #651217 #981C22

Accessibility & contrast

On white

17.88

#31090B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.17

#31090B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #31090B

17.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##31090B	#FFFFFF	#000000	##FFFFFF
##31090B	1.00	17.88	1.17	17.88
#FFFFFF	17.88	1.00	21.00	1.00
#000000	1.17	21.00	1.00	21.00
##FFFFFF	17.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#14120B

Deuteranopia (green-blind)

#1E1A0A

Tritanopia (blue-blind)

#37020A

Achromatopsia (no color)

#171717

Design tokens & code

CSS

--color: #31090b;
/* rgb */ color: rgb(49, 9, 11);
/* oklch */ color: oklch(21.4% 0.065 21.7);

Tailwind

colors: {
  custom: {
    50: '#6c4b4b',
    500: '#31090b',
    950: '#000000',
  },
}

SCSS

$custom: #31090b;
$custom-light: #6c4b4b;
$custom-dark: #000000;

JSON

{
  "hex": "#31090b",
  "rgb": {
    "r": 49,
    "g": 9,
    "b": 11
  },
  "hsl": {
    "h": 357,
    "s": 68.966,
    "l": 11.373
  },
  "oklch": {
    "l": 0.21375,
    "c": 0.06463,
    "h": 21.7
  },
  "luminance": 0.00873
}

Semantic roles & 50–950 ramp

primary

#31090B

secondary

#276F6B

accent

#ECE33C

background

#F6F4F4

surface

#ECE7E7

border

#C7C3C3

text

#070101

muted

#7A7777

Preview Lab

Preview with #31090B

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

Preview Lab → · Contrast checker → · Palette generator →