#643A40#643A40

#643A40 is a dark, muted red. Relative luminance 0.061; OKLCH L 40.1% C 0.060 H 10.9°. Best body text is #FFFFFF at 9.45:1 contrast (WCAG AA passes).

Color values

HEX	#643A40
RGB	rgb(100, 58, 64)
HSL	hsl(351, 27%, 31%)
HSV	hsv(351, 42%, 39%)
CMYK	cmyk(0%, 42%, 36%, 60.8%)
CIE-LAB	lab(29.68, 19.40, 4.28)
CIE-LCH	lch(29.68, 19.87, 12.43°)
OKLab	oklab(40.13% 0.0588 0.0113)
OKLCH	oklch(40.13% 0.06 10.9)
XYZ	xyz(7.6943, 6.1062, 5.6229)
Luminance	0.0611 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643A40 #3A645E

analogous

#643A55 #643A40 #64493A

triadic

#643A40 #40643A #3A4064

tetradic

#643A40 #55643A #3A645E #493A64

square

#643A40 #55643A #3A645E #493A64

split-complementary

#643A40 #3A6449 #3A5564

monochromatic

#170D0E #3D2427 #643A40 #8B5059 #AB6E76

Accessibility & contrast

On white

9.45

#643A40 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#643A40 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643A40

9.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643A40	#FFFFFF	#000000	##FFFFFF
##643A40	1.00	9.45	2.22	9.45
#FFFFFF	9.45	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#414140

Deuteranopia (green-blind)

#4C493F

Tritanopia (blue-blind)

#6B363C

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643a40;
/* rgb */ color: rgb(100, 58, 64);
/* oklch */ color: oklch(40.1% 0.060 10.9);

Tailwind

colors: {
  custom: {
    50: '#927174',
    500: '#643a40',
    950: '#000000',
  },
}

SCSS

$custom: #643a40;
$custom-light: #927174;
$custom-dark: #000000;

JSON

{
  "hex": "#643a40",
  "rgb": {
    "r": 100,
    "g": 58,
    "b": 64
  },
  "hsl": {
    "h": 351.429,
    "s": 26.582,
    "l": 30.98
  },
  "oklch": {
    "l": 0.40125,
    "c": 0.05992,
    "h": 10.9
  },
  "luminance": 0.06106
}

Semantic roles & 50–950 ramp

primary

#643A40

secondary

#66948D

accent

#C3B665

background

#F9F6F7

surface

#F1ECED

border

#CBC7C8

text

#0D0708

muted

#7E7A7B

Preview Lab

Preview with #643A40

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

Preview Lab → · Contrast checker → · Palette generator →