#643B3D#643B3D

#643B3D is a dark, muted red. Relative luminance 0.062; OKLCH L 40.2% C 0.058 H 16.8°. Best body text is #FFFFFF at 9.40:1 contrast (WCAG AA passes).

Color values

HEX	#643B3D
RGB	rgb(100, 59, 61)
HSL	hsl(357, 26%, 31%)
HSV	hsv(357, 41%, 39%)
CMYK	cmyk(0%, 41%, 39%, 60.8%)
CIE-LAB	lab(29.85, 18.37, 6.48)
CIE-LCH	lch(29.85, 19.48, 19.43°)
OKLab	oklab(40.23% 0.0557 0.0168)
OKLCH	oklch(40.23% 0.058 16.8)
XYZ	xyz(7.6621, 6.1748, 5.2023)
Luminance	0.0617 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643B3D #3B6462

analogous

#643B51 #643B3D #644D3B

triadic

#643B3D #3D643B #3B3D64

tetradic

#643B3D #51643B #3B6462 #4D3B64

square

#643B3D #51643B #3B6462 #4D3B64

split-complementary

#643B3D #3B644D #3B5164

monochromatic

#170E0E #3E2426 #643B3D #8A5254 #AA6F72

Accessibility & contrast

On white

9.40

#643B3D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#643B3D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643B3D

9.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643B3D	#FFFFFF	#000000	##FFFFFF
##643B3D	1.00	9.40	2.23	9.40
#FFFFFF	9.40	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#43413D

Deuteranopia (green-blind)

#4D493C

Tritanopia (blue-blind)

#6B373C

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643b3d;
/* rgb */ color: rgb(100, 59, 61);
/* oklch */ color: oklch(40.2% 0.058 16.8);

Tailwind

colors: {
  custom: {
    50: '#927172',
    500: '#643b3d',
    950: '#000000',
  },
}

SCSS

$custom: #643b3d;
$custom-light: #927172;
$custom-dark: #000000;

JSON

{
  "hex": "#643b3d",
  "rgb": {
    "r": 100,
    "g": 59,
    "b": 61
  },
  "hsl": {
    "h": 357.073,
    "s": 25.786,
    "l": 31.176
  },
  "oklch": {
    "l": 0.40228,
    "c": 0.05815,
    "h": 16.8
  },
  "luminance": 0.06174
}

Semantic roles & 50–950 ramp

primary

#643B3D

secondary

#679492

accent

#C2BE66

background

#F9F6F6

surface

#F1ECEC

border

#CBC7C7

text

#0D0808

muted

#7E7B7B

Preview Lab

Preview with #643B3D

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

Preview Lab → · Contrast checker → · Palette generator →