#643C3D#643C3D

#643C3D is a dark, muted red. Relative luminance 0.063; OKLCH L 40.4% C 0.057 H 18.2°. Best body text is #FFFFFF at 9.31:1 contrast (WCAG AA passes).

Color values

HEX	#643C3D
RGB	rgb(100, 60, 61)
HSL	hsl(359, 25%, 31%)
HSV	hsv(359, 40%, 39%)
CMYK	cmyk(0%, 40%, 39%, 60.8%)
CIE-LAB	lab(30.10, 17.75, 6.84)
CIE-LCH	lch(30.10, 19.02, 21.07°)
OKLab	oklab(40.42% 0.0538 0.0177)
OKLCH	oklch(40.42% 0.057 18.2)
XYZ	xyz(7.7140, 6.2786, 5.2196)
Luminance	0.0628 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643C3D #3C6463

analogous

#643C51 #643C3D #644F3C

triadic

#643C3D #3D643C #3C3D64

tetradic

#643C3D #51643C #3C6463 #4F3C64

square

#643C3D #51643C #3C6463 #4F3C64

split-complementary

#643C3D #3C644F #3C5164

monochromatic

#180E0E #3E2526 #643C3D #8A5354 #AA7172

Accessibility & contrast

On white

9.31

#643C3D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#643C3D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643C3D

9.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643C3D	#FFFFFF	#000000	##FFFFFF
##643C3D	1.00	9.31	2.26	9.31
#FFFFFF	9.31	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.31	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#44423D

Deuteranopia (green-blind)

#4D4A3C

Tritanopia (blue-blind)

#6B383D

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #643c3d;
/* rgb */ color: rgb(100, 60, 61);
/* oklch */ color: oklch(40.4% 0.057 18.2);

Tailwind

colors: {
  custom: {
    50: '#927272',
    500: '#643c3d',
    950: '#000000',
  },
}

SCSS

$custom: #643c3d;
$custom-light: #927272;
$custom-dark: #000000;

JSON

{
  "hex": "#643c3d",
  "rgb": {
    "r": 100,
    "g": 60,
    "b": 61
  },
  "hsl": {
    "h": 358.5,
    "s": 25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.40424,
    "c": 0.05664,
    "h": 18.2
  },
  "luminance": 0.06278
}

Semantic roles & 50–950 ramp

primary

#643C3D

secondary

#689493

accent

#C1BF66

background

#F9F6F6

surface

#F1ECEC

border

#CBC7C7

text

#0D0808

muted

#7E7B7B

Preview Lab

Preview with #643C3D

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

Preview Lab → · Contrast checker → · Palette generator →