#643D3F#643D3F

#643D3F is a dark, muted red. Relative luminance 0.064; OKLCH L 40.7% C 0.055 H 16.4°. Best body text is #FFFFFF at 9.21:1 contrast (WCAG AA passes).

Color values

HEX	#643D3F
RGB	rgb(100, 61, 63)
HSL	hsl(357, 24%, 32%)
HSV	hsv(357, 39%, 39%)
CMYK	cmyk(0%, 39%, 37%, 60.8%)
CIE-LAB	lab(30.42, 17.42, 5.98)
CIE-LCH	lch(30.42, 18.41, 18.94°)
OKLab	oklab(40.68% 0.0528 0.0156)
OKLCH	oklch(40.68% 0.055 16.4)
XYZ	xyz(7.8218, 6.4063, 5.5262)
Luminance	0.0641 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643D3F #3D6462

analogous

#643D53 #643D3F #644F3D

triadic

#643D3F #3F643D #3D3F64

tetradic

#643D3F #53643D #3D6462 #4F3D64

square

#643D3F #53643D #3D6462 #4F3D64

split-complementary

#643D3F #3D644F #3D5364

monochromatic

#180F0F #3E2627 #643D3F #8A5457 #A97275

Accessibility & contrast

On white

9.21

#643D3F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.28

#643D3F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643D3F

9.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643D3F	#FFFFFF	#000000	##FFFFFF
##643D3F	1.00	9.21	2.28	9.21
#FFFFFF	9.21	1.00	21.00	1.00
#000000	2.28	21.00	1.00	21.00
##FFFFFF	9.21	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#44433F

Deuteranopia (green-blind)

#4E4B3E

Tritanopia (blue-blind)

#6B393E

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #643d3f;
/* rgb */ color: rgb(100, 61, 63);
/* oklch */ color: oklch(40.7% 0.055 16.4);

Tailwind

colors: {
  custom: {
    50: '#927374',
    500: '#643d3f',
    950: '#000000',
  },
}

SCSS

$custom: #643d3f;
$custom-light: #927374;
$custom-dark: #000000;

JSON

{
  "hex": "#643d3f",
  "rgb": {
    "r": 100,
    "g": 61,
    "b": 63
  },
  "hsl": {
    "h": 356.923,
    "s": 24.224,
    "l": 31.569
  },
  "oklch": {
    "l": 0.4068,
    "c": 0.05508,
    "h": 16.4
  },
  "luminance": 0.06406
}

Semantic roles & 50–950 ramp

primary

#643D3F

secondary

#699492

accent

#C1BC67

background

#F9F7F7

surface

#F1EDED

border

#CBC8C8

text

#0D0808

muted

#7E7B7B

Preview Lab

Preview with #643D3F

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

Preview Lab → · Contrast checker → · Palette generator →