#643C3C#643C3C

#643C3C is a dark, muted red. Relative luminance 0.063; OKLCH L 40.4% C 0.057 H 19.8°. Best body text is #FFFFFF at 9.32:1 contrast (WCAG AA passes).

Color values

HEX	#643C3C
RGB	rgb(100, 60, 60)
HSL	hsl(0, 25%, 31%)
HSV	hsv(0, 40%, 39%)
CMYK	cmyk(0%, 40%, 40%, 60.8%)
CIE-LAB	lab(30.08, 17.62, 7.45)
CIE-LCH	lch(30.08, 19.13, 22.93°)
OKLab	oklab(40.39% 0.0533 0.0193)
OKLCH	oklch(40.39% 0.057 19.8)
XYZ	xyz(7.6873, 6.2679, 5.0790)
Luminance	0.0627 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643C3C #3C6464

analogous

#643C50 #643C3C #64503C

triadic

#643C3C #3C643C #3C3C64

tetradic

#643C3C #50643C #3C6464 #503C64

square

#643C3C #50643C #3C6464 #503C64

split-complementary

#643C3C #3C6450 #3C5064

monochromatic

#180E0E #3E2525 #643C3C #8A5353 #AA7171

Accessibility & contrast

On white

9.32

#643C3C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.25

#643C3C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643C3C

9.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643C3C	#FFFFFF	#000000	##FFFFFF
##643C3C	1.00	9.32	2.25	9.32
#FFFFFF	9.32	1.00	21.00	1.00
#000000	2.25	21.00	1.00	21.00
##FFFFFF	9.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#44423C

Deuteranopia (green-blind)

#4E4A3B

Tritanopia (blue-blind)

#6B373C

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #643c3c;
/* rgb */ color: rgb(100, 60, 60);
/* oklch */ color: oklch(40.4% 0.057 19.8);

Tailwind

colors: {
  custom: {
    50: '#927271',
    500: '#643c3c',
    950: '#000000',
  },
}

SCSS

$custom: #643c3c;
$custom-light: #927271;
$custom-dark: #000000;

JSON

{
  "hex": "#643c3c",
  "rgb": {
    "r": 100,
    "g": 60,
    "b": 60
  },
  "hsl": {
    "h": 0,
    "s": 25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.40395,
    "c": 0.05671,
    "h": 19.8
  },
  "luminance": 0.06267
}

Semantic roles & 50–950 ramp

primary

#643C3C

secondary

#689494

accent

#C1C166

background

#F9F6F6

surface

#F1ECEC

border

#CBC7C7

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643C3C

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

Preview Lab → · Contrast checker → · Palette generator →