#643B31#643B31

#643B31 is a dark, moderate red. Relative luminance 0.061; OKLCH L 39.9% C 0.061 H 34.5°. Best body text is #FFFFFF at 9.49:1 contrast (WCAG AA passes).

Color values

HEX	#643B31
RGB	rgb(100, 59, 49)
HSL	hsl(12, 34%, 29%)
HSV	hsv(12, 51%, 39%)
CMYK	cmyk(0%, 41%, 51%, 60.8%)
CIE-LAB	lab(29.56, 16.86, 13.85)
CIE-LCH	lch(29.56, 21.83, 39.40°)
OKLab	oklab(39.92% 0.0502 0.0345)
OKLCH	oklch(39.92% 0.061 34.5)
XYZ	xyz(7.3743, 6.0596, 3.6864)
Luminance	0.0606 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643B31 #315A64

analogous

#643141 #643B31 #645531

triadic

#643B31 #31643B #3B3164

tetradic

#643B31 #416431 #315A64 #553164

square

#643B31 #416431 #315A64 #553164

split-complementary

#643B31 #316455 #314164

monochromatic

#150C0A #3B231D #643B31 #8D5345 #B16F5F

Accessibility & contrast

On white

9.49

#643B31 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.21

#643B31 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643B31

9.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643B31	#FFFFFF	#000000	##FFFFFF
##643B31	1.00	9.49	2.21	9.49
#FFFFFF	9.49	1.00	21.00	1.00
#000000	2.21	21.00	1.00	21.00
##FFFFFF	9.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#454030

Deuteranopia (green-blind)

#4F4930

Tritanopia (blue-blind)

#6C3538

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643b31;
/* rgb */ color: rgb(100, 59, 49);
/* oklch */ color: oklch(39.9% 0.061 34.5);

Tailwind

colors: {
  custom: {
    50: '#927169',
    500: '#643b31',
    950: '#000000',
  },
}

SCSS

$custom: #643b31;
$custom-light: #927169;
$custom-dark: #000000;

JSON

{
  "hex": "#643b31",
  "rgb": {
    "r": 100,
    "g": 59,
    "b": 49
  },
  "hsl": {
    "h": 11.765,
    "s": 34.228,
    "l": 29.216
  },
  "oklch": {
    "l": 0.39915,
    "c": 0.06089,
    "h": 34.5
  },
  "luminance": 0.06059
}

Semantic roles & 50–950 ramp

primary

#643B31

secondary

#5C8A95

accent

#B5CA5D

background

#F9F6F6

surface

#F1ECEB

border

#CBC7C6

text

#0D0706

muted

#7E7A7A

Preview Lab

Preview with #643B31

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

Preview Lab → · Contrast checker → · Palette generator →