#643A39#643A39

#643A39 is a dark, muted red. Relative luminance 0.060; OKLCH L 39.9% C 0.060 H 21.6°. Best body text is #FFFFFF at 9.52:1 contrast (WCAG AA passes).

Color values

HEX	#643A39
RGB	rgb(100, 58, 57)
HSL	hsl(1, 27%, 31%)
HSV	hsv(1, 43%, 39%)
CMYK	cmyk(0%, 42%, 43%, 60.8%)
CIE-LAB	lab(29.49, 18.45, 8.58)
CIE-LCH	lch(29.49, 20.34, 24.95°)
OKLab	oklab(39.92% 0.0557 0.022)
OKLCH	oklch(39.92% 0.06 21.6)
XYZ	xyz(7.5075, 6.0315, 4.6389)
Luminance	0.0603 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643A39 #396364

analogous

#64394D #643A39 #644F39

triadic

#643A39 #39643A #3A3964

tetradic

#643A39 #4D6439 #396364 #4F3964

square

#643A39 #4D6439 #396364 #4F3964

split-complementary

#643A39 #39644F #394D64

monochromatic

#160D0D #3D2323 #643A39 #8B514F #AB6E6C

Accessibility & contrast

On white

9.52

#643A39 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.21

#643A39 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643A39

9.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643A39	#FFFFFF	#000000	##FFFFFF
##643A39	1.00	9.52	2.21	9.52
#FFFFFF	9.52	1.00	21.00	1.00
#000000	2.21	21.00	1.00	21.00
##FFFFFF	9.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#434039

Deuteranopia (green-blind)

#4D4938

Tritanopia (blue-blind)

#6C353A

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #643a39;
/* rgb */ color: rgb(100, 58, 57);
/* oklch */ color: oklch(39.9% 0.060 21.6);

Tailwind

colors: {
  custom: {
    50: '#92716f',
    500: '#643a39',
    950: '#000000',
  },
}

SCSS

$custom: #643a39;
$custom-light: #92716f;
$custom-dark: #000000;

JSON

{
  "hex": "#643a39",
  "rgb": {
    "r": 100,
    "g": 58,
    "b": 57
  },
  "hsl": {
    "h": 1.395,
    "s": 27.389,
    "l": 30.784
  },
  "oklch": {
    "l": 0.39921,
    "c": 0.05991,
    "h": 21.6
  },
  "luminance": 0.06031
}

Semantic roles & 50–950 ramp

primary

#643A39

secondary

#659394

accent

#C1C464

background

#F9F6F6

surface

#F1ECEC

border

#CBC7C7

text

#0D0707

muted

#7E7A7A

Preview Lab

Preview with #643A39

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

Preview Lab → · Contrast checker → · Palette generator →