#643D37#643D37

#643D37 is a dark, muted red. Relative luminance 0.063; OKLCH L 40.5% C 0.056 H 29.3°. Best body text is #FFFFFF at 9.27:1 contrast (WCAG AA passes).

Color values

HEX	#643D37
RGB	rgb(100, 61, 55)
HSL	hsl(8, 29%, 30%)
HSV	hsv(8, 45%, 39%)
CMYK	cmyk(0%, 39%, 45%, 60.8%)
CIE-LAB	lab(30.21, 16.34, 10.87)
CIE-LCH	lch(30.21, 19.63, 33.64°)
OKLab	oklab(40.46% 0.0492 0.0276)
OKLCH	oklch(40.46% 0.056 29.3)
XYZ	xyz(7.6142, 6.3233, 4.4332)
Luminance	0.0632 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643D37 #375E64

analogous

#643747 #643D37 #645337

triadic

#643D37 #37643D #3D3764

tetradic

#643D37 #476437 #375E64 #533764

square

#643D37 #476437 #375E64 #533764

split-complementary

#643D37 #376453 #374764

monochromatic

#150D0C #3D2521 #643D37 #8B554D #AC7269

Accessibility & contrast

On white

9.27

#643D37 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#643D37 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643D37

9.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643D37	#FFFFFF	#000000	##FFFFFF
##643D37	1.00	9.27	2.26	9.27
#FFFFFF	9.27	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#464236

Deuteranopia (green-blind)

#4F4A36

Tritanopia (blue-blind)

#6C383C

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #643d37;
/* rgb */ color: rgb(100, 61, 55);
/* oklch */ color: oklch(40.5% 0.056 29.3);

Tailwind

colors: {
  custom: {
    50: '#92736d',
    500: '#643d37',
    950: '#000000',
  },
}

SCSS

$custom: #643d37;
$custom-light: #92736d;
$custom-dark: #000000;

JSON

{
  "hex": "#643d37",
  "rgb": {
    "r": 100,
    "g": 61,
    "b": 55
  },
  "hsl": {
    "h": 8,
    "s": 29.032,
    "l": 30.392
  },
  "oklch": {
    "l": 0.40459,
    "c": 0.05639,
    "h": 29.3
  },
  "luminance": 0.06323
}

Semantic roles & 50–950 ramp

primary

#643D37

secondary

#628E94

accent

#B8C562

background

#F9F6F6

surface

#F1ECEB

border

#CBC7C6

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643D37

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

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