#643B3F#643B3F

#643B3F is a dark, muted red. Relative luminance 0.062; OKLCH L 40.3% C 0.058 H 13.7°. Best body text is #FFFFFF at 9.38:1 contrast (WCAG AA passes).

Color values

HEX	#643B3F
RGB	rgb(100, 59, 63)
HSL	hsl(354, 26%, 31%)
HSV	hsv(354, 41%, 39%)
CMYK	cmyk(0%, 41%, 37%, 60.8%)
CIE-LAB	lab(29.90, 18.65, 5.25)
CIE-LCH	lch(29.90, 19.37, 15.73°)
OKLab	oklab(40.29% 0.0566 0.0138)
OKLCH	oklch(40.29% 0.058 13.7)
XYZ	xyz(7.7170, 6.1967, 5.4913)
Luminance	0.0620 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643B3F #3B6460

analogous

#643B53 #643B3F #644B3B

triadic

#643B3F #3F643B #3B3F64

tetradic

#643B3F #53643B #3B6460 #4B3B64

square

#643B3F #53643B #3B6460 #4B3B64

split-complementary

#643B3F #3B644B #3B5364

monochromatic

#170E0F #3E2427 #643B3F #8A5257 #AA6F75

Accessibility & contrast

On white

9.38

#643B3F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.24

#643B3F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643B3F

9.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643B3F	#FFFFFF	#000000	##FFFFFF
##643B3F	1.00	9.38	2.24	9.38
#FFFFFF	9.38	1.00	21.00	1.00
#000000	2.24	21.00	1.00	21.00
##FFFFFF	9.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#42423F

Deuteranopia (green-blind)

#4C493E

Tritanopia (blue-blind)

#6B373D

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643b3f;
/* rgb */ color: rgb(100, 59, 63);
/* oklch */ color: oklch(40.3% 0.058 13.7);

Tailwind

colors: {
  custom: {
    50: '#927174',
    500: '#643b3f',
    950: '#000000',
  },
}

SCSS

$custom: #643b3f;
$custom-light: #927174;
$custom-dark: #000000;

JSON

{
  "hex": "#643b3f",
  "rgb": {
    "r": 100,
    "g": 59,
    "b": 63
  },
  "hsl": {
    "h": 354.146,
    "s": 25.786,
    "l": 31.176
  },
  "oklch": {
    "l": 0.40288,
    "c": 0.0582,
    "h": 13.7
  },
  "luminance": 0.06196
}

Semantic roles & 50–950 ramp

primary

#643B3F

secondary

#679490

accent

#C2B966

background

#F9F6F7

surface

#F1ECED

border

#CBC7C8

text

#0D0808

muted

#7E7B7B

Preview Lab

Preview with #643B3F

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

Preview Lab → · Contrast checker → · Palette generator →