#643F40#643F40

#643F40 is a dark, muted red. Relative luminance 0.066; OKLCH L 41.1% C 0.052 H 17.8°. Best body text is #FFFFFF at 9.02:1 contrast (WCAG AA passes).

Color values

HEX	#643F40
RGB	rgb(100, 63, 64)
HSL	hsl(358, 23%, 32%)
HSV	hsv(358, 37%, 39%)
CMYK	cmyk(0%, 37%, 36%, 60.8%)
CIE-LAB	lab(30.96, 16.33, 6.10)
CIE-LCH	lch(30.96, 17.43, 20.50°)
OKLab	oklab(41.11% 0.0495 0.0159)
OKLCH	oklch(41.11% 0.052 17.8)
XYZ	xyz(7.9587, 6.6351, 5.7110)
Luminance	0.0664 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643F40 #3F6463

analogous

#643F53 #643F40 #64513F

triadic

#643F40 #40643F #3F4064

tetradic

#643F40 #53643F #3F6463 #513F64

square

#643F40 #53643F #3F6463 #513F64

split-complementary

#643F40 #3F6451 #3F5364

monochromatic

#191010 #3E2728 #643F40 #8A5758 #A87577

Accessibility & contrast

On white

9.02

#643F40 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.33

#643F40 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643F40

9.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643F40	#FFFFFF	#000000	##FFFFFF
##643F40	1.00	9.02	2.33	9.02
#FFFFFF	9.02	1.00	21.00	1.00
#000000	2.33	21.00	1.00	21.00
##FFFFFF	9.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#464540

Deuteranopia (green-blind)

#4F4C3F

Tritanopia (blue-blind)

#6B3B40

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #643f40;
/* rgb */ color: rgb(100, 63, 64);
/* oklch */ color: oklch(41.1% 0.052 17.8);

Tailwind

colors: {
  custom: {
    50: '#917474',
    500: '#643f40',
    950: '#000000',
  },
}

SCSS

$custom: #643f40;
$custom-light: #917474;
$custom-dark: #000000;

JSON

{
  "hex": "#643f40",
  "rgb": {
    "r": 100,
    "g": 63,
    "b": 64
  },
  "hsl": {
    "h": 358.378,
    "s": 22.699,
    "l": 31.961
  },
  "oklch": {
    "l": 0.41108,
    "c": 0.05204,
    "h": 17.8
  },
  "luminance": 0.06635
}

Semantic roles & 50–950 ramp

primary

#643F40

secondary

#6B9493

accent

#BFBD69

background

#F9F7F7

surface

#F1EDED

border

#CBC8C8

text

#0D0808

muted

#7E7B7B

Preview Lab

Preview with #643F40

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

Preview Lab → · Contrast checker → · Palette generator →