#643F3C#643F3C

#643F3C is a dark, muted red. Relative luminance 0.066; OKLCH L 41.0% C 0.053 H 24.7°. Best body text is #FFFFFF at 9.06:1 contrast (WCAG AA passes).

Color values

HEX	#643F3C
RGB	rgb(100, 63, 60)
HSL	hsl(5, 25%, 31%)
HSV	hsv(5, 40%, 39%)
CMYK	cmyk(0%, 37%, 40%, 60.8%)
CIE-LAB	lab(30.86, 15.76, 8.54)
CIE-LCH	lch(30.86, 17.93, 28.45°)
OKLab	oklab(40.99% 0.0477 0.0219)
OKLCH	oklch(40.99% 0.053 24.7)
XYZ	xyz(7.8490, 6.5912, 5.1329)
Luminance	0.0659 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643F3C #3C6164

analogous

#643C4D #643F3C #64533C

triadic

#643F3C #3C643F #3F3C64

tetradic

#643F3C #4D643C #3C6164 #533C64

square

#643F3C #4D643C #3C6164 #533C64

split-complementary

#643F3C #3C6453 #3C4D64

monochromatic

#180F0E #3E2725 #643F3C #8A5753 #AA7571

Accessibility & contrast

On white

9.06

#643F3C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.32

#643F3C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643F3C

9.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643F3C	#FFFFFF	#000000	##FFFFFF
##643F3C	1.00	9.06	2.32	9.06
#FFFFFF	9.06	1.00	21.00	1.00
#000000	2.32	21.00	1.00	21.00
##FFFFFF	9.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#47443C

Deuteranopia (green-blind)

#504B3B

Tritanopia (blue-blind)

#6B3A3E

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #643f3c;
/* rgb */ color: rgb(100, 63, 60);
/* oklch */ color: oklch(41.0% 0.053 24.7);

Tailwind

colors: {
  custom: {
    50: '#927471',
    500: '#643f3c',
    950: '#000000',
  },
}

SCSS

$custom: #643f3c;
$custom-light: #927471;
$custom-dark: #000000;

JSON

{
  "hex": "#643f3c",
  "rgb": {
    "r": 100,
    "g": 63,
    "b": 60
  },
  "hsl": {
    "h": 4.5,
    "s": 25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.40994,
    "c": 0.05254,
    "h": 24.7
  },
  "luminance": 0.06591
}

Semantic roles & 50–950 ramp

primary

#643F3C

secondary

#689194

accent

#BBC166

background

#F9F7F6

surface

#F1EDEC

border

#CBC8C7

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643F3C

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

Preview Lab → · Contrast checker → · Palette generator →