#643D3C#643D3C

#643D3C is a dark, muted red. Relative luminance 0.064; OKLCH L 40.6% C 0.055 H 21.4°. Best body text is #FFFFFF at 9.23:1 contrast (WCAG AA passes).

Color values

HEX	#643D3C
RGB	rgb(100, 61, 60)
HSL	hsl(2, 25%, 31%)
HSV	hsv(2, 40%, 39%)
CMYK	cmyk(0%, 39%, 40%, 60.8%)
CIE-LAB	lab(30.34, 17.00, 7.81)
CIE-LCH	lch(30.34, 18.71, 24.68°)
OKLab	oklab(40.59% 0.0515 0.0201)
OKLCH	oklch(40.59% 0.055 21.4)
XYZ	xyz(7.7402, 6.3736, 5.0967)
Luminance	0.0637 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643D3C #3C6364

analogous

#643C4F #643D3C #64513C

triadic

#643D3C #3C643D #3D3C64

tetradic

#643D3C #4F643C #3C6364 #513C64

square

#643D3C #4F643C #3C6364 #513C64

split-complementary

#643D3C #3C6451 #3C4F64

monochromatic

#180E0E #3E2625 #643D3C #8A5453 #AA7271

Accessibility & contrast

On white

9.23

#643D3C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.27

#643D3C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643D3C

9.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643D3C	#FFFFFF	#000000	##FFFFFF
##643D3C	1.00	9.23	2.27	9.23
#FFFFFF	9.23	1.00	21.00	1.00
#000000	2.27	21.00	1.00	21.00
##FFFFFF	9.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#45433C

Deuteranopia (green-blind)

#4E4A3B

Tritanopia (blue-blind)

#6B383D

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #643d3c;
/* rgb */ color: rgb(100, 61, 60);
/* oklch */ color: oklch(40.6% 0.055 21.4);

Tailwind

colors: {
  custom: {
    50: '#927371',
    500: '#643d3c',
    950: '#000000',
  },
}

SCSS

$custom: #643d3c;
$custom-light: #927371;
$custom-dark: #000000;

JSON

{
  "hex": "#643d3c",
  "rgb": {
    "r": 100,
    "g": 61,
    "b": 60
  },
  "hsl": {
    "h": 1.5,
    "s": 25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.40593,
    "c": 0.05528,
    "h": 21.4
  },
  "luminance": 0.06373
}

Semantic roles & 50–950 ramp

primary

#643D3C

secondary

#689394

accent

#BFC166

background

#F9F7F6

surface

#F1EDEC

border

#CBC8C7

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643D3C

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

Preview Lab → · Contrast checker → · Palette generator →