#643F3A#643F3A

#643F3A is a dark, muted red. Relative luminance 0.066; OKLCH L 40.9% C 0.053 H 28.0°. Best body text is #FFFFFF at 9.08:1 contrast (WCAG AA passes).

Color values

HEX	#643F3A
RGB	rgb(100, 63, 58)
HSL	hsl(7, 27%, 31%)
HSV	hsv(7, 42%, 39%)
CMYK	cmyk(0%, 37%, 42%, 60.8%)
CIE-LAB	lab(30.81, 15.49, 9.76)
CIE-LCH	lch(30.81, 18.31, 32.21°)
OKLab	oklab(40.94% 0.0468 0.0249)
OKLCH	oklch(40.94% 0.053 28)
XYZ	xyz(7.7971, 6.5704, 4.8597)
Luminance	0.0657 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643F3A #3A5F64

analogous

#643A4A #643F3A #64543A

triadic

#643F3A #3A643F #3F3A64

tetradic

#643F3A #4A643A #3A5F64 #543A64

square

#643F3A #4A643A #3A5F64 #543A64

split-complementary

#643F3A #3A6454 #3A4A64

monochromatic

#170E0D #3D2724 #643F3A #8B5750 #AB756E

Accessibility & contrast

On white

9.08

#643F3A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.31

#643F3A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643F3A

9.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643F3A	#FFFFFF	#000000	##FFFFFF
##643F3A	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)

#47443A

Deuteranopia (green-blind)

#504B3A

Tritanopia (blue-blind)

#6C3A3E

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #643f3a;
/* rgb */ color: rgb(100, 63, 58);
/* oklch */ color: oklch(40.9% 0.053 28.0);

Tailwind

colors: {
  custom: {
    50: '#927470',
    500: '#643f3a',
    950: '#000000',
  },
}

SCSS

$custom: #643f3a;
$custom-light: #927470;
$custom-dark: #000000;

JSON

{
  "hex": "#643f3a",
  "rgb": {
    "r": 100,
    "g": 63,
    "b": 58
  },
  "hsl": {
    "h": 7.143,
    "s": 26.582,
    "l": 30.98
  },
  "oklch": {
    "l": 0.4094,
    "c": 0.05304,
    "h": 28
  },
  "luminance": 0.0657
}

Semantic roles & 50–950 ramp

primary

#643F3A

secondary

#668F94

accent

#B8C365

background

#F9F7F6

surface

#F1EDEC

border

#CBC8C7

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643F3A

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

Preview Lab → · Contrast checker → · Palette generator →