#643D38#643D38

#643D38 is a dark, muted red. Relative luminance 0.063; OKLCH L 40.5% C 0.056 H 27.7°. Best body text is #FFFFFF at 9.27:1 contrast (WCAG AA passes).

Color values

HEX	#643D38
RGB	rgb(100, 61, 56)
HSL	hsl(7, 28%, 31%)
HSV	hsv(7, 44%, 39%)
CMYK	cmyk(0%, 39%, 44%, 60.8%)
CIE-LAB	lab(30.24, 16.47, 10.26)
CIE-LCH	lch(30.24, 19.41, 31.92°)
OKLab	oklab(40.49% 0.0497 0.0261)
OKLCH	oklch(40.49% 0.056 27.7)
XYZ	xyz(7.6384, 6.3329, 4.5607)
Luminance	0.0633 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643D38 #385F64

analogous

#643849 #643D38 #645338

triadic

#643D38 #38643D #3D3864

tetradic

#643D38 #496438 #385F64 #533864

square

#643D38 #496438 #385F64 #533864

split-complementary

#643D38 #386453 #384964

monochromatic

#160D0C #3D2522 #643D38 #8B554E #AC726B

Accessibility & contrast

On white

9.27

#643D38 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.27

#643D38 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643D38

9.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643D38	#FFFFFF	#000000	##FFFFFF
##643D38	1.00	9.27	2.27	9.27
#FFFFFF	9.27	1.00	21.00	1.00
#000000	2.27	21.00	1.00	21.00
##FFFFFF	9.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#464237

Deuteranopia (green-blind)

#4F4A37

Tritanopia (blue-blind)

#6C383C

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #643d38;
/* rgb */ color: rgb(100, 61, 56);
/* oklch */ color: oklch(40.5% 0.056 27.7);

Tailwind

colors: {
  custom: {
    50: '#92736e',
    500: '#643d38',
    950: '#000000',
  },
}

SCSS

$custom: #643d38;
$custom-light: #92736e;
$custom-dark: #000000;

JSON

{
  "hex": "#643d38",
  "rgb": {
    "r": 100,
    "g": 61,
    "b": 56
  },
  "hsl": {
    "h": 6.818,
    "s": 28.205,
    "l": 30.588
  },
  "oklch": {
    "l": 0.40485,
    "c": 0.05609,
    "h": 27.7
  },
  "luminance": 0.06332
}

Semantic roles & 50–950 ramp

primary

#643D38

secondary

#638F94

accent

#B9C563

background

#F9F6F6

surface

#F1ECEB

border

#CBC7C6

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643D38

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

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