#643E38#643E38

#643E38 is a dark, muted red. Relative luminance 0.064; OKLCH L 40.7% C 0.055 H 29.4°. Best body text is #FFFFFF at 9.18:1 contrast (WCAG AA passes).

Color values

HEX	#643E38
RGB	rgb(100, 62, 56)
HSL	hsl(8, 28%, 31%)
HSV	hsv(8, 44%, 39%)
CMYK	cmyk(0%, 38%, 44%, 60.8%)
CIE-LAB	lab(30.50, 15.85, 10.62)
CIE-LCH	lch(30.50, 19.08, 33.82°)
OKLab	oklab(40.69% 0.0478 0.027)
OKLCH	oklch(40.69% 0.055 29.4)
XYZ	xyz(7.6923, 6.4407, 4.5787)
Luminance	0.0644 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643E38 #385E64

analogous

#643848 #643E38 #645438

triadic

#643E38 #38643E #3E3864

tetradic

#643E38 #486438 #385E64 #543864

square

#643E38 #486438 #385E64 #543864

split-complementary

#643E38 #386454 #384864

monochromatic

#160D0C #3D2622 #643E38 #8B564E #AC736B

Accessibility & contrast

On white

9.18

#643E38 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.29

#643E38 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643E38

9.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643E38	#FFFFFF	#000000	##FFFFFF
##643E38	1.00	9.18	2.29	9.18
#FFFFFF	9.18	1.00	21.00	1.00
#000000	2.29	21.00	1.00	21.00
##FFFFFF	9.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#464337

Deuteranopia (green-blind)

#504B38

Tritanopia (blue-blind)

#6C393D

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #643e38;
/* rgb */ color: rgb(100, 62, 56);
/* oklch */ color: oklch(40.7% 0.055 29.4);

Tailwind

colors: {
  custom: {
    50: '#92736e',
    500: '#643e38',
    950: '#000000',
  },
}

SCSS

$custom: #643e38;
$custom-light: #92736e;
$custom-dark: #000000;

JSON

{
  "hex": "#643e38",
  "rgb": {
    "r": 100,
    "g": 62,
    "b": 56
  },
  "hsl": {
    "h": 8.182,
    "s": 28.205,
    "l": 30.588
  },
  "oklch": {
    "l": 0.40685,
    "c": 0.05486,
    "h": 29.4
  },
  "luminance": 0.0644
}

Semantic roles & 50–950 ramp

primary

#643E38

secondary

#638E94

accent

#B7C563

background

#F9F7F6

surface

#F1EDEB

border

#CBC8C6

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643E38

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

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