#643E39#643E39

#643E39 is a dark, muted red. Relative luminance 0.065; OKLCH L 40.7% C 0.055 H 27.9°. Best body text is #FFFFFF at 9.17:1 contrast (WCAG AA passes).

Color values

HEX	#643E39
RGB	rgb(100, 62, 57)
HSL	hsl(7, 27%, 31%)
HSV	hsv(7, 43%, 39%)
CMYK	cmyk(0%, 38%, 43%, 60.8%)
CIE-LAB	lab(30.52, 15.98, 10.01)
CIE-LCH	lch(30.52, 18.86, 32.06°)
OKLab	oklab(40.71% 0.0482 0.0255)
OKLCH	oklch(40.71% 0.055 27.9)
XYZ	xyz(7.7170, 6.4506, 4.7087)
Luminance	0.0645 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643E39 #395F64

analogous

#643949 #643E39 #645339

triadic

#643E39 #39643E #3E3964

tetradic

#643E39 #496439 #395F64 #533964

square

#643E39 #496439 #395F64 #533964

split-complementary

#643E39 #396453 #394964

monochromatic

#160E0D #3D2623 #643E39 #8B564F #AB736C

Accessibility & contrast

On white

9.17

#643E39 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.29

#643E39 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643E39

9.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643E39	#FFFFFF	#000000	##FFFFFF
##643E39	1.00	9.17	2.29	9.17
#FFFFFF	9.17	1.00	21.00	1.00
#000000	2.29	21.00	1.00	21.00
##FFFFFF	9.17	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#464339

Deuteranopia (green-blind)

#4F4B38

Tritanopia (blue-blind)

#6C393D

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #643e39;
/* rgb */ color: rgb(100, 62, 57);
/* oklch */ color: oklch(40.7% 0.055 27.9);

Tailwind

colors: {
  custom: {
    50: '#92736f',
    500: '#643e39',
    950: '#000000',
  },
}

SCSS

$custom: #643e39;
$custom-light: #92736f;
$custom-dark: #000000;

JSON

{
  "hex": "#643e39",
  "rgb": {
    "r": 100,
    "g": 62,
    "b": 57
  },
  "hsl": {
    "h": 6.977,
    "s": 27.389,
    "l": 30.784
  },
  "oklch": {
    "l": 0.40711,
    "c": 0.05457,
    "h": 27.9
  },
  "luminance": 0.0645
}

Semantic roles & 50–950 ramp

primary

#643E39

secondary

#658F94

accent

#B9C464

background

#F9F7F6

surface

#F1EDEC

border

#CBC8C7

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643E39

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

Preview Lab → · Contrast checker → · Palette generator →