#643F3D#643F3D

#643F3D is a dark, muted red. Relative luminance 0.066; OKLCH L 41.0% C 0.052 H 23.0°. Best body text is #FFFFFF at 9.05:1 contrast (WCAG AA passes).

Color values

HEX	#643F3D
RGB	rgb(100, 63, 61)
HSL	hsl(3, 24%, 32%)
HSV	hsv(3, 39%, 39%)
CMYK	cmyk(0%, 37%, 39%, 60.8%)
CIE-LAB	lab(30.88, 15.90, 7.93)
CIE-LCH	lch(30.88, 17.77, 26.51°)
OKLab	oklab(41.02% 0.0482 0.0204)
OKLCH	oklch(41.02% 0.052 23)
XYZ	xyz(7.8756, 6.6018, 5.2735)
Luminance	0.0660 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643F3D #3D6264

analogous

#643D4F #643F3D #64533D

triadic

#643F3D #3D643F #3F3D64

tetradic

#643F3D #4F643D #3D6264 #533D64

square

#643F3D #4F643D #3D6264 #533D64

split-complementary

#643F3D #3D6453 #3D4F64

monochromatic

#180F0F #3E2726 #643F3D #8A5754 #A97572

Accessibility & contrast

On white

9.05

#643F3D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.32

#643F3D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643F3D

9.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643F3D	#FFFFFF	#000000	##FFFFFF
##643F3D	1.00	9.05	2.32	9.05
#FFFFFF	9.05	1.00	21.00	1.00
#000000	2.32	21.00	1.00	21.00
##FFFFFF	9.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#47443D

Deuteranopia (green-blind)

#4F4C3C

Tritanopia (blue-blind)

#6B3B3F

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #643f3d;
/* rgb */ color: rgb(100, 63, 61);
/* oklch */ color: oklch(41.0% 0.052 23.0);

Tailwind

colors: {
  custom: {
    50: '#927472',
    500: '#643f3d',
    950: '#000000',
  },
}

SCSS

$custom: #643f3d;
$custom-light: #927472;
$custom-dark: #000000;

JSON

{
  "hex": "#643f3d",
  "rgb": {
    "r": 100,
    "g": 63,
    "b": 61
  },
  "hsl": {
    "h": 3.077,
    "s": 24.224,
    "l": 31.569
  },
  "oklch": {
    "l": 0.41021,
    "c": 0.05235,
    "h": 23
  },
  "luminance": 0.06601
}

Semantic roles & 50–950 ramp

primary

#643F3D

secondary

#699294

accent

#BCC167

background

#F9F7F6

surface

#F1EDEC

border

#CBC8C7

text

#0D0808

muted

#7E7B7B

Preview Lab

Preview with #643F3D

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

Preview Lab → · Contrast checker → · Palette generator →