#310B0B#310B0B

#310B0B is a very dark, moderate red. Relative luminance 0.009; OKLCH L 21.7% C 0.062 H 23.9°. Best body text is #FFFFFF at 17.75:1 contrast (WCAG AA passes).

Color values

HEX	#310B0B
RGB	rgb(49, 11, 11)
HSL	hsl(0, 63%, 12%)
HSV	hsv(0, 78%, 19%)
CMYK	cmyk(0%, 77.6%, 77.6%, 80.8%)
CIE-LAB	lab(8.28, 19.27, 8.30)
CIE-LCH	lch(8.28, 20.98, 23.31°)
OKLab	oklab(21.67% 0.0567 0.0251)
OKLCH	oklch(21.67% 0.062 23.9)
XYZ	xyz(1.4468, 0.9167, 0.4173)
Luminance	0.0092 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#310B0B #0B3131

analogous

#310B1E #310B0B #311E0B

triadic

#310B0B #0B310B #0B0B31

tetradic

#310B0B #1E310B #0B3131 #1E0B31

square

#310B0B #1E310B #0B3131 #1E0B31

split-complementary

#310B0B #0B311E #0B1E31

monochromatic

#190606 #190606 #310B0B #631616 #952121

Accessibility & contrast

On white

17.75

#310B0B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.18

#310B0B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #310B0B

17.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##310B0B	#FFFFFF	#000000	##FFFFFF
##310B0B	1.00	17.75	1.18	17.75
#FFFFFF	17.75	1.00	21.00	1.00
#000000	1.18	21.00	1.00	21.00
##FFFFFF	17.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#15130B

Deuteranopia (green-blind)

#1F1B0A

Tritanopia (blue-blind)

#37040B

Achromatopsia (no color)

#181818

Design tokens & code

CSS

--color: #310b0b;
/* rgb */ color: rgb(49, 11, 11);
/* oklch */ color: oklch(21.7% 0.062 23.9);

Tailwind

colors: {
  custom: {
    50: '#6c4c4b',
    500: '#310b0b',
    950: '#000000',
  },
}

SCSS

$custom: #310b0b;
$custom-light: #6c4c4b;
$custom-dark: #000000;

JSON

{
  "hex": "#310b0b",
  "rgb": {
    "r": 49,
    "g": 11,
    "b": 11
  },
  "hsl": {
    "h": 0,
    "s": 63.333,
    "l": 11.765
  },
  "oklch": {
    "l": 0.2167,
    "c": 0.06194,
    "h": 23.9
  },
  "luminance": 0.00916
}

Semantic roles & 50–950 ramp

primary

#310B0B

secondary

#2A6E6E

accent

#E6E641

background

#F6F4F4

surface

#ECE7E7

border

#C7C3C3

text

#070101

muted

#7A7777

Preview Lab

Preview with #310B0B

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

Preview Lab → · Contrast checker → · Palette generator →