#643D3A#643D3A

#643D3A is a dark, muted red. Relative luminance 0.064; OKLCH L 40.5% C 0.056 H 24.6°. Best body text is #FFFFFF at 9.25:1 contrast (WCAG AA passes).

Color values

HEX	#643D3A
RGB	rgb(100, 61, 58)
HSL	hsl(4, 27%, 31%)
HSV	hsv(4, 42%, 39%)
CMYK	cmyk(0%, 39%, 42%, 60.8%)
CIE-LAB	lab(30.29, 16.73, 9.04)
CIE-LCH	lch(30.29, 19.02, 28.37°)
OKLab	oklab(40.54% 0.0506 0.0231)
OKLCH	oklch(40.54% 0.056 24.6)
XYZ	xyz(7.6883, 6.3529, 4.8235)
Luminance	0.0635 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643D3A #3A6164

analogous

#643A4C #643D3A #64523A

triadic

#643D3A #3A643D #3D3A64

tetradic

#643D3A #4C643A #3A6164 #523A64

square

#643D3A #4C643A #3A6164 #523A64

split-complementary

#643D3A #3A6452 #3A4C64

monochromatic

#170E0D #3D2524 #643D3A #8B5550 #AB726E

Accessibility & contrast

On white

9.25

#643D3A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.27

#643D3A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643D3A

9.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643D3A	#FFFFFF	#000000	##FFFFFF
##643D3A	1.00	9.25	2.27	9.25
#FFFFFF	9.25	1.00	21.00	1.00
#000000	2.27	21.00	1.00	21.00
##FFFFFF	9.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#45433A

Deuteranopia (green-blind)

#4F4A39

Tritanopia (blue-blind)

#6C383C

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #643d3a;
/* rgb */ color: rgb(100, 61, 58);
/* oklch */ color: oklch(40.5% 0.056 24.6);

Tailwind

colors: {
  custom: {
    50: '#927370',
    500: '#643d3a',
    950: '#000000',
  },
}

SCSS

$custom: #643d3a;
$custom-light: #927370;
$custom-dark: #000000;

JSON

{
  "hex": "#643d3a",
  "rgb": {
    "r": 100,
    "g": 61,
    "b": 58
  },
  "hsl": {
    "h": 4.286,
    "s": 26.582,
    "l": 30.98
  },
  "oklch": {
    "l": 0.40538,
    "c": 0.05561,
    "h": 24.6
  },
  "luminance": 0.06352
}

Semantic roles & 50–950 ramp

primary

#643D3A

secondary

#669194

accent

#BCC365

background

#F9F6F6

surface

#F1ECEC

border

#CBC7C7

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643D3A

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

Preview Lab → · Contrast checker → · Palette generator →