#643F39#643F39

#643F39 is a dark, muted red. Relative luminance 0.066; OKLCH L 40.9% C 0.053 H 29.6°. Best body text is #FFFFFF at 9.08:1 contrast (WCAG AA passes).

Color values

HEX	#643F39
RGB	rgb(100, 63, 57)
HSL	hsl(8, 27%, 31%)
HSV	hsv(8, 43%, 39%)
CMYK	cmyk(0%, 37%, 43%, 60.8%)
CIE-LAB	lab(30.78, 15.36, 10.37)
CIE-LCH	lch(30.78, 18.54, 34.02°)
OKLab	oklab(40.91% 0.0464 0.0264)
OKLCH	oklch(40.91% 0.053 29.6)
XYZ	xyz(7.7719, 6.5603, 4.7270)
Luminance	0.0656 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643F39 #395E64

analogous

#643948 #643F39 #645439

triadic

#643F39 #39643F #3F3964

tetradic

#643F39 #486439 #395E64 #543964

square

#643F39 #486439 #395E64 #543964

split-complementary

#643F39 #396454 #394864

monochromatic

#160E0D #3D2623 #643F39 #8B584F #AB756C

Accessibility & contrast

On white

9.08

#643F39 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.31

#643F39 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643F39

9.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643F39	#FFFFFF	#000000	##FFFFFF
##643F39	1.00	9.08	2.31	9.08
#FFFFFF	9.08	1.00	21.00	1.00
#000000	2.31	21.00	1.00	21.00
##FFFFFF	9.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#474438

Deuteranopia (green-blind)

#504B39

Tritanopia (blue-blind)

#6C3A3D

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #643f39;
/* rgb */ color: rgb(100, 63, 57);
/* oklch */ color: oklch(40.9% 0.053 29.6);

Tailwind

colors: {
  custom: {
    50: '#92746f',
    500: '#643f39',
    950: '#000000',
  },
}

SCSS

$custom: #643f39;
$custom-light: #92746f;
$custom-dark: #000000;

JSON

{
  "hex": "#643f39",
  "rgb": {
    "r": 100,
    "g": 63,
    "b": 57
  },
  "hsl": {
    "h": 8.372,
    "s": 27.389,
    "l": 30.784
  },
  "oklch": {
    "l": 0.40913,
    "c": 0.05335,
    "h": 29.6
  },
  "luminance": 0.0656
}

Semantic roles & 50–950 ramp

primary

#643F39

secondary

#658E94

accent

#B6C464

background

#F9F7F6

surface

#F1EDEC

border

#CBC8C7

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643F39

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

Preview Lab → · Contrast checker → · Palette generator →