#643B33#643B33

#643B33 is a dark, moderate red. Relative luminance 0.061; OKLCH L 40.0% C 0.060 H 31.8°. Best body text is #FFFFFF at 9.48:1 contrast (WCAG AA passes).

Color values

HEX	#643B33
RGB	rgb(100, 59, 51)
HSL	hsl(10, 32%, 30%)
HSV	hsv(10, 49%, 39%)
CMYK	cmyk(0%, 41%, 49%, 60.8%)
CIE-LAB	lab(29.61, 17.09, 12.63)
CIE-LCH	lch(29.61, 21.25, 36.45°)
OKLab	oklab(39.96% 0.0511 0.0316)
OKLCH	oklch(39.96% 0.06 31.8)
XYZ	xyz(7.4174, 6.0769, 3.9136)
Luminance	0.0608 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643B33 #335C64

analogous

#643344 #643B33 #645433

triadic

#643B33 #33643B #3B3364

tetradic

#643B33 #446433 #335C64 #543364

square

#643B33 #446433 #335C64 #543364

split-complementary

#643B33 #336454 #334464

monochromatic

#140C0A #3B231E #643B33 #8D5348 #AF6F62

Accessibility & contrast

On white

9.48

#643B33 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#643B33 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643B33

9.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643B33	#FFFFFF	#000000	##FFFFFF
##643B33	1.00	9.48	2.22	9.48
#FFFFFF	9.48	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#454132

Deuteranopia (green-blind)

#4E4932

Tritanopia (blue-blind)

#6C3539

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643b33;
/* rgb */ color: rgb(100, 59, 51);
/* oklch */ color: oklch(40.0% 0.060 31.8);

Tailwind

colors: {
  custom: {
    50: '#92716a',
    500: '#643b33',
    950: '#000000',
  },
}

SCSS

$custom: #643b33;
$custom-light: #92716a;
$custom-dark: #000000;

JSON

{
  "hex": "#643b33",
  "rgb": {
    "r": 100,
    "g": 59,
    "b": 51
  },
  "hsl": {
    "h": 9.796,
    "s": 32.45,
    "l": 29.608
  },
  "oklch": {
    "l": 0.39962,
    "c": 0.06011,
    "h": 31.8
  },
  "luminance": 0.06076
}

Semantic roles & 50–950 ramp

primary

#643B33

secondary

#5E8C95

accent

#B7C95F

background

#F9F6F6

surface

#F1ECEB

border

#CBC7C6

text

#0D0706

muted

#7E7A7A

Preview Lab

Preview with #643B33

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

Preview Lab → · Contrast checker → · Palette generator →