#643A43#643A43

#643A43 is a dark, moderate red. Relative luminance 0.061; OKLCH L 40.2% C 0.060 H 6.3°. Best body text is #FFFFFF at 9.42:1 contrast (WCAG AA passes).

Color values

HEX	#643A43
RGB	rgb(100, 58, 67)
HSL	hsl(347, 27%, 31%)
HSV	hsv(347, 42%, 39%)
CMYK	cmyk(0%, 42%, 33%, 60.8%)
CIE-LAB	lab(29.77, 19.85, 2.44)
CIE-LCH	lch(29.77, 20.00, 7.02°)
OKLab	oklab(40.22% 0.0601 0.0066)
OKLCH	oklch(40.22% 0.061 6.3)
XYZ	xyz(7.7820, 6.1413, 6.0846)
Luminance	0.0614 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643A43 #3A645B

analogous

#643A58 #643A43 #64463A

triadic

#643A43 #43643A #3A4364

tetradic

#643A43 #58643A #3A645B #463A64

square

#643A43 #58643A #3A645B #463A64

split-complementary

#643A43 #3A6446 #3A5864

monochromatic

#170D0F #3D2429 #643A43 #8B505D #AB6E7B

Accessibility & contrast

On white

9.42

#643A43 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#643A43 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643A43

9.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643A43	#FFFFFF	#000000	##FFFFFF
##643A43	1.00	9.42	2.23	9.42
#FFFFFF	9.42	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#414143

Deuteranopia (green-blind)

#4B4942

Tritanopia (blue-blind)

#6B373D

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643a43;
/* rgb */ color: rgb(100, 58, 67);
/* oklch */ color: oklch(40.2% 0.060 6.3);

Tailwind

colors: {
  custom: {
    50: '#917177',
    500: '#643a43',
    950: '#000000',
  },
}

SCSS

$custom: #643a43;
$custom-light: #917177;
$custom-dark: #000000;

JSON

{
  "hex": "#643a43",
  "rgb": {
    "r": 100,
    "g": 58,
    "b": 67
  },
  "hsl": {
    "h": 347.143,
    "s": 26.582,
    "l": 30.98
  },
  "oklch": {
    "l": 0.40221,
    "c": 0.0605,
    "h": 6.3
  },
  "luminance": 0.06141
}

Semantic roles & 50–950 ramp

primary

#643A43

secondary

#66948A

accent

#C3AF65

background

#F9F6F7

surface

#F1ECED

border

#CBC7C8

text

#0D0708

muted

#7E7A7B

Preview Lab

Preview with #643A43

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

Preview Lab → · Contrast checker → · Palette generator →