#631B13#631B13

#631B13 is a dark, moderate red. Relative luminance 0.035; OKLCH L 33.9% C 0.105 H 29.8°. Best body text is #FFFFFF at 12.38:1 contrast (WCAG AA passes).

Color values

HEX	#631B13
RGB	rgb(99, 27, 19)
HSL	hsl(6, 68%, 23%)
HSV	hsv(6, 81%, 39%)
CMYK	cmyk(0%, 72.7%, 80.8%, 61.2%)
CIE-LAB	lab(21.89, 31.89, 23.57)
CIE-LCH	lch(21.89, 39.66, 36.47°)
OKLab	oklab(33.88% 0.0913 0.0523)
OKLCH	oklch(33.88% 0.105 29.8)
XYZ	xyz(5.6557, 3.4844, 0.9907)
Luminance	0.0348 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#631B13 #135B63

analogous

#631333 #631B13 #634313

triadic

#631B13 #13631B #1B1363

tetradic

#631B13 #336313 #135B63 #431363

square

#631B13 #336313 #135B63 #431363

split-complementary

#631B13 #136343 #133363

monochromatic

#1A0705 #300D09 #631B13 #96291D #CA3727

Accessibility & contrast

On white

12.38

#631B13 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.70

#631B13 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #631B13

12.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##631B13	#FFFFFF	#000000	##FFFFFF
##631B13	1.00	12.38	1.70	12.38
#FFFFFF	12.38	1.00	21.00	1.00
#000000	1.70	21.00	1.00	21.00
##FFFFFF	12.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#302A12

Deuteranopia (green-blind)

#423A10

Tritanopia (blue-blind)

#6E051A

Achromatopsia (no color)

#343434

Design tokens & code

CSS

--color: #631b13;
/* rgb */ color: rgb(99, 27, 19);
/* oklch */ color: oklch(33.9% 0.105 29.8);

Tailwind

colors: {
  custom: {
    50: '#965c51',
    500: '#631b13',
    950: '#000000',
  },
}

SCSS

$custom: #631b13;
$custom-light: #965c51;
$custom-dark: #000000;

JSON

{
  "hex": "#631b13",
  "rgb": {
    "r": 99,
    "g": 27,
    "b": 19
  },
  "hsl": {
    "h": 6,
    "s": 67.797,
    "l": 23.137
  },
  "oklch": {
    "l": 0.33883,
    "c": 0.10522,
    "h": 29.8
  },
  "luminance": 0.03484
}

Semantic roles & 50–950 ramp

primary

#631B13

secondary

#37919B

accent

#D9EB3D

background

#F9F5F4

surface

#F2E9E7

border

#CCC5C3

text

#0F0402

muted

#7E7978

Preview Lab

Preview with #631B13

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

Preview Lab → · Contrast checker → · Palette generator →