#643A37#643A37

#643A37 is a dark, moderate red. Relative luminance 0.060; OKLCH L 39.9% C 0.060 H 24.5°. Best body text is #FFFFFF at 9.54:1 contrast (WCAG AA passes).

Color values

HEX	#643A37
RGB	rgb(100, 58, 55)
HSL	hsl(4, 29%, 30%)
HSV	hsv(4, 45%, 39%)
CMYK	cmyk(0%, 42%, 45%, 60.8%)
CIE-LAB	lab(29.44, 18.19, 9.81)
CIE-LCH	lch(29.44, 20.67, 28.35°)
OKLab	oklab(39.87% 0.0548 0.025)
OKLCH	oklch(39.87% 0.06 24.5)
XYZ	xyz(7.4586, 6.0119, 4.3813)
Luminance	0.0601 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643A37 #376164

analogous

#64374A #643A37 #645037

triadic

#643A37 #37643A #3A3764

tetradic

#643A37 #4A6437 #376164 #503764

square

#643A37 #4A6437 #376164 #503764

split-complementary

#643A37 #376450 #374A64

monochromatic

#150C0C #3D2321 #643A37 #8B514D #AC6D69

Accessibility & contrast

On white

9.54

#643A37 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.20

#643A37 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643A37

9.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643A37	#FFFFFF	#000000	##FFFFFF
##643A37	1.00	9.54	2.20	9.54
#FFFFFF	9.54	1.00	21.00	1.00
#000000	2.20	21.00	1.00	21.00
##FFFFFF	9.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#434037

Deuteranopia (green-blind)

#4D4936

Tritanopia (blue-blind)

#6C3539

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #643a37;
/* rgb */ color: rgb(100, 58, 55);
/* oklch */ color: oklch(39.9% 0.060 24.5);

Tailwind

colors: {
  custom: {
    50: '#92716d',
    500: '#643a37',
    950: '#000000',
  },
}

SCSS

$custom: #643a37;
$custom-light: #92716d;
$custom-dark: #000000;

JSON

{
  "hex": "#643a37",
  "rgb": {
    "r": 100,
    "g": 58,
    "b": 55
  },
  "hsl": {
    "h": 4,
    "s": 29.032,
    "l": 30.392
  },
  "oklch": {
    "l": 0.39867,
    "c": 0.06023,
    "h": 24.5
  },
  "luminance": 0.06011
}

Semantic roles & 50–950 ramp

primary

#643A37

secondary

#629194

accent

#BFC562

background

#F9F6F6

surface

#F1ECEB

border

#CBC7C6

text

#0D0707

muted

#7E7A7A

Preview Lab

Preview with #643A37

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

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