#643B38#643B38

#643B38 is a dark, muted red. Relative luminance 0.061; OKLCH L 40.1% C 0.059 H 24.5°. Best body text is #FFFFFF at 9.44:1 contrast (WCAG AA passes).

Color values

HEX	#643B38
RGB	rgb(100, 59, 56)
HSL	hsl(4, 28%, 31%)
HSV	hsv(4, 44%, 39%)
CMYK	cmyk(0%, 41%, 44%, 60.8%)
CIE-LAB	lab(29.72, 17.70, 9.55)
CIE-LCH	lch(29.72, 20.12, 28.35°)
OKLab	oklab(40.09% 0.0534 0.0244)
OKLCH	oklch(40.09% 0.059 24.5)
XYZ	xyz(7.5337, 6.1234, 4.5258)
Luminance	0.0612 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643B38 #386164

analogous

#64384B #643B38 #645138

triadic

#643B38 #38643B #3B3864

tetradic

#643B38 #4B6438 #386164 #513864

square

#643B38 #4B6438 #386164 #513864

split-complementary

#643B38 #386451 #384B64

monochromatic

#160D0C #3D2422 #643B38 #8B524E #AC6F6B

Accessibility & contrast

On white

9.44

#643B38 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#643B38 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643B38

9.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643B38	#FFFFFF	#000000	##FFFFFF
##643B38	1.00	9.44	2.22	9.44
#FFFFFF	9.44	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#444138

Deuteranopia (green-blind)

#4E4937

Tritanopia (blue-blind)

#6C363A

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643b38;
/* rgb */ color: rgb(100, 59, 56);
/* oklch */ color: oklch(40.1% 0.059 24.5);

Tailwind

colors: {
  custom: {
    50: '#92716e',
    500: '#643b38',
    950: '#000000',
  },
}

SCSS

$custom: #643b38;
$custom-light: #92716e;
$custom-dark: #000000;

JSON

{
  "hex": "#643b38",
  "rgb": {
    "r": 100,
    "g": 59,
    "b": 56
  },
  "hsl": {
    "h": 4.091,
    "s": 28.205,
    "l": 30.588
  },
  "oklch": {
    "l": 0.40089,
    "c": 0.05869,
    "h": 24.5
  },
  "luminance": 0.06123
}

Semantic roles & 50–950 ramp

primary

#643B38

secondary

#639194

accent

#BEC563

background

#F9F6F6

surface

#F1ECEB

border

#CBC7C6

text

#0D0707

muted

#7E7A7A

Preview Lab

Preview with #643B38

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

Preview Lab → · Contrast checker → · Palette generator →