#643A3A#643A3A

#643A3A is a dark, muted red. Relative luminance 0.060; OKLCH L 39.9% C 0.060 H 20.1°. Best body text is #FFFFFF at 9.51:1 contrast (WCAG AA passes).

Color values

HEX	#643A3A
RGB	rgb(100, 58, 58)
HSL	hsl(0, 27%, 31%)
HSV	hsv(0, 42%, 39%)
CMYK	cmyk(0%, 42%, 42%, 60.8%)
CIE-LAB	lab(29.52, 18.58, 7.97)
CIE-LCH	lch(29.52, 20.21, 23.21°)
OKLab	oklab(39.95% 0.0562 0.0205)
OKLCH	oklch(39.95% 0.06 20.1)
XYZ	xyz(7.5327, 6.0415, 4.7716)
Luminance	0.0604 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643A3A #3A6464

analogous

#643A4F #643A3A #644F3A

triadic

#643A3A #3A643A #3A3A64

tetradic

#643A3A #4F643A #3A6464 #4F3A64

square

#643A3A #4F643A #3A6464 #4F3A64

split-complementary

#643A3A #3A644F #3A4F64

monochromatic

#170D0D #3D2424 #643A3A #8B5050 #AB6E6E

Accessibility & contrast

On white

9.51

#643A3A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.21

#643A3A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643A3A

9.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643A3A	#FFFFFF	#000000	##FFFFFF
##643A3A	1.00	9.51	2.21	9.51
#FFFFFF	9.51	1.00	21.00	1.00
#000000	2.21	21.00	1.00	21.00
##FFFFFF	9.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#42403A

Deuteranopia (green-blind)

#4D4939

Tritanopia (blue-blind)

#6C353A

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643a3a;
/* rgb */ color: rgb(100, 58, 58);
/* oklch */ color: oklch(39.9% 0.060 20.1);

Tailwind

colors: {
  custom: {
    50: '#927170',
    500: '#643a3a',
    950: '#000000',
  },
}

SCSS

$custom: #643a3a;
$custom-light: #927170;
$custom-dark: #000000;

JSON

{
  "hex": "#643a3a",
  "rgb": {
    "r": 100,
    "g": 58,
    "b": 58
  },
  "hsl": {
    "h": 0,
    "s": 26.582,
    "l": 30.98
  },
  "oklch": {
    "l": 0.39948,
    "c": 0.05979,
    "h": 20.1
  },
  "luminance": 0.06041
}

Semantic roles & 50–950 ramp

primary

#643A3A

secondary

#669494

accent

#C3C365

background

#F9F6F6

surface

#F1ECEC

border

#CBC7C7

text

#0D0707

muted

#7E7A7A

Preview Lab

Preview with #643A3A

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

Preview Lab → · Contrast checker → · Palette generator →