#643D40#643D40

#643D40 is a dark, muted red. Relative luminance 0.064; OKLCH L 40.7% C 0.055 H 14.8°. Best body text is #FFFFFF at 9.20:1 contrast (WCAG AA passes).

Color values

HEX	#643D40
RGB	rgb(100, 61, 64)
HSL	hsl(355, 24%, 32%)
HSV	hsv(355, 39%, 39%)
CMYK	cmyk(0%, 39%, 36%, 60.8%)
CIE-LAB	lab(30.44, 17.56, 5.37)
CIE-LCH	lch(30.44, 18.36, 16.99°)
OKLab	oklab(40.71% 0.0533 0.0141)
OKLCH	oklch(40.71% 0.055 14.8)
XYZ	xyz(7.8500, 6.4176, 5.6748)
Luminance	0.0642 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643D40 #3D6461

analogous

#643D54 #643D40 #644E3D

triadic

#643D40 #40643D #3D4064

tetradic

#643D40 #54643D #3D6461 #4E3D64

square

#643D40 #54643D #3D6461 #4E3D64

split-complementary

#643D40 #3D644E #3D5464

monochromatic

#180F0F #3E2628 #643D40 #8A5458 #A97276

Accessibility & contrast

On white

9.20

#643D40 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.28

#643D40 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643D40

9.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643D40	#FFFFFF	#000000	##FFFFFF
##643D40	1.00	9.20	2.28	9.20
#FFFFFF	9.20	1.00	21.00	1.00
#000000	2.28	21.00	1.00	21.00
##FFFFFF	9.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#444340

Deuteranopia (green-blind)

#4E4B3F

Tritanopia (blue-blind)

#6B393E

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #643d40;
/* rgb */ color: rgb(100, 61, 64);
/* oklch */ color: oklch(40.7% 0.055 14.8);

Tailwind

colors: {
  custom: {
    50: '#917374',
    500: '#643d40',
    950: '#000000',
  },
}

SCSS

$custom: #643d40;
$custom-light: #917374;
$custom-dark: #000000;

JSON

{
  "hex": "#643d40",
  "rgb": {
    "r": 100,
    "g": 61,
    "b": 64
  },
  "hsl": {
    "h": 355.385,
    "s": 24.224,
    "l": 31.569
  },
  "oklch": {
    "l": 0.40709,
    "c": 0.05509,
    "h": 14.8
  },
  "luminance": 0.06417
}

Semantic roles & 50–950 ramp

primary

#643D40

secondary

#699491

accent

#C1BA67

background

#F9F7F7

surface

#F1EDED

border

#CBC8C8

text

#0D0808

muted

#7E7B7B

Preview Lab

Preview with #643D40

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

Preview Lab → · Contrast checker → · Palette generator →