#643A3D#643A3D

#643A3D is a dark, muted red. Relative luminance 0.061; OKLCH L 40.0% C 0.060 H 15.5°. Best body text is #FFFFFF at 9.48:1 contrast (WCAG AA passes).

Color values

HEX	#643A3D
RGB	rgb(100, 58, 61)
HSL	hsl(356, 27%, 31%)
HSV	hsv(356, 42%, 39%)
CMYK	cmyk(0%, 42%, 39%, 60.8%)
CIE-LAB	lab(29.60, 18.98, 6.12)
CIE-LCH	lch(29.60, 19.94, 17.87°)
OKLab	oklab(40.03% 0.0575 0.0159)
OKLCH	oklch(40.03% 0.06 15.5)
XYZ	xyz(7.6112, 6.0730, 5.1853)
Luminance	0.0607 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643A3D #3A6461

analogous

#643A52 #643A3D #644C3A

triadic

#643A3D #3D643A #3A3D64

tetradic

#643A3D #52643A #3A6461 #4C3A64

square

#643A3D #52643A #3A6461 #4C3A64

split-complementary

#643A3D #3A644C #3A5264

monochromatic

#170D0E #3D2425 #643A3D #8B5055 #AB6E72

Accessibility & contrast

On white

9.48

#643A3D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.21

#643A3D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643A3D

9.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643A3D	#FFFFFF	#000000	##FFFFFF
##643A3D	1.00	9.48	2.21	9.48
#FFFFFF	9.48	1.00	21.00	1.00
#000000	2.21	21.00	1.00	21.00
##FFFFFF	9.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#42413D

Deuteranopia (green-blind)

#4C493C

Tritanopia (blue-blind)

#6B363B

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643a3d;
/* rgb */ color: rgb(100, 58, 61);
/* oklch */ color: oklch(40.0% 0.060 15.5);

Tailwind

colors: {
  custom: {
    50: '#927172',
    500: '#643a3d',
    950: '#000000',
  },
}

SCSS

$custom: #643a3d;
$custom-light: #927172;
$custom-dark: #000000;

JSON

{
  "hex": "#643a3d",
  "rgb": {
    "r": 100,
    "g": 58,
    "b": 61
  },
  "hsl": {
    "h": 355.714,
    "s": 26.582,
    "l": 30.98
  },
  "oklch": {
    "l": 0.40035,
    "c": 0.05969,
    "h": 15.5
  },
  "luminance": 0.06072
}

Semantic roles & 50–950 ramp

primary

#643A3D

secondary

#669491

accent

#C3BC65

background

#F9F6F6

surface

#F1ECEC

border

#CBC7C7

text

#0D0708

muted

#7E7A7B

Preview Lab

Preview with #643A3D

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

Preview Lab → · Contrast checker → · Palette generator →