#643C40#643C40

#643C40 is a dark, muted red. Relative luminance 0.063; OKLCH L 40.5% C 0.057 H 13.4°. Best body text is #FFFFFF at 9.28:1 contrast (WCAG AA passes).

Color values

HEX	#643C40
RGB	rgb(100, 60, 64)
HSL	hsl(354, 25%, 31%)
HSV	hsv(354, 40%, 39%)
CMYK	cmyk(0%, 40%, 36%, 60.8%)
CIE-LAB	lab(30.19, 18.18, 5.00)
CIE-LCH	lch(30.19, 18.85, 15.38°)
OKLab	oklab(40.51% 0.0551 0.0131)
OKLCH	oklch(40.51% 0.057 13.4)
XYZ	xyz(7.7971, 6.3118, 5.6571)
Luminance	0.0631 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643C40 #3C6460

analogous

#643C54 #643C40 #644C3C

triadic

#643C40 #40643C #3C4064

tetradic

#643C40 #54643C #3C6460 #4C3C64

square

#643C40 #54643C #3C6460 #4C3C64

split-complementary

#643C40 #3C644C #3C5464

monochromatic

#180E0F #3E2528 #643C40 #8A5358 #AA7176

Accessibility & contrast

On white

9.28

#643C40 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#643C40 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643C40

9.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643C40	#FFFFFF	#000000	##FFFFFF
##643C40	1.00	9.28	2.26	9.28
#FFFFFF	9.28	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#434240

Deuteranopia (green-blind)

#4D4A3F

Tritanopia (blue-blind)

#6B383E

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #643c40;
/* rgb */ color: rgb(100, 60, 64);
/* oklch */ color: oklch(40.5% 0.057 13.4);

Tailwind

colors: {
  custom: {
    50: '#927274',
    500: '#643c40',
    950: '#000000',
  },
}

SCSS

$custom: #643c40;
$custom-light: #927274;
$custom-dark: #000000;

JSON

{
  "hex": "#643c40",
  "rgb": {
    "r": 100,
    "g": 60,
    "b": 64
  },
  "hsl": {
    "h": 354,
    "s": 25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.40513,
    "c": 0.05667,
    "h": 13.4
  },
  "luminance": 0.06311
}

Semantic roles & 50–950 ramp

primary

#643C40

secondary

#689490

accent

#C1B866

background

#F9F6F7

surface

#F1ECED

border

#CBC7C8

text

#0D0808

muted

#7E7B7B

Preview Lab

Preview with #643C40

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

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