#643E40#643E40

#643E40 is a dark, muted red. Relative luminance 0.065; OKLCH L 40.9% C 0.054 H 16.2°. Best body text is #FFFFFF at 9.11:1 contrast (WCAG AA passes).

Color values

HEX	#643E40
RGB	rgb(100, 62, 64)
HSL	hsl(357, 23%, 32%)
HSV	hsv(357, 38%, 39%)
CMYK	cmyk(0%, 38%, 36%, 60.8%)
CIE-LAB	lab(30.70, 16.94, 5.73)
CIE-LCH	lch(30.70, 17.89, 18.69°)
OKLab	oklab(40.91% 0.0514 0.015)
OKLCH	oklch(40.91% 0.054 16.2)
XYZ	xyz(7.9039, 6.5253, 5.6927)
Luminance	0.0653 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643E40 #3E6462

analogous

#643E53 #643E40 #644F3E

triadic

#643E40 #40643E #3E4064

tetradic

#643E40 #53643E #3E6462 #4F3E64

square

#643E40 #53643E #3E6462 #4F3E64

split-complementary

#643E40 #3E644F #3E5364

monochromatic

#180F10 #3E2728 #643E40 #8A5558 #A97477

Accessibility & contrast

On white

9.11

#643E40 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.31

#643E40 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643E40

9.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643E40	#FFFFFF	#000000	##FFFFFF
##643E40	1.00	9.11	2.31	9.11
#FFFFFF	9.11	1.00	21.00	1.00
#000000	2.31	21.00	1.00	21.00
##FFFFFF	9.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#454440

Deuteranopia (green-blind)

#4E4B3F

Tritanopia (blue-blind)

#6B3A3F

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #643e40;
/* rgb */ color: rgb(100, 62, 64);
/* oklch */ color: oklch(40.9% 0.054 16.2);

Tailwind

colors: {
  custom: {
    50: '#917374',
    500: '#643e40',
    950: '#000000',
  },
}

SCSS

$custom: #643e40;
$custom-light: #917374;
$custom-dark: #000000;

JSON

{
  "hex": "#643e40",
  "rgb": {
    "r": 100,
    "g": 62,
    "b": 64
  },
  "hsl": {
    "h": 356.842,
    "s": 23.457,
    "l": 31.765
  },
  "oklch": {
    "l": 0.40908,
    "c": 0.05355,
    "h": 16.2
  },
  "luminance": 0.06525
}

Semantic roles & 50–950 ramp

primary

#643E40

secondary

#6A9492

accent

#C0BB68

background

#F9F7F7

surface

#F1EDED

border

#CBC8C8

text

#0D0808

muted

#7E7B7B

Preview Lab

Preview with #643E40

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

Preview Lab → · Contrast checker → · Palette generator →