#643B40#643B40

#643B40 is a dark, muted red. Relative luminance 0.062; OKLCH L 40.3% C 0.058 H 12.1°. Best body text is #FFFFFF at 9.37:1 contrast (WCAG AA passes).

Color values

HEX	#643B40
RGB	rgb(100, 59, 64)
HSL	hsl(353, 26%, 31%)
HSV	hsv(353, 41%, 39%)
CMYK	cmyk(0%, 41%, 36%, 60.8%)
CIE-LAB	lab(29.93, 18.79, 4.64)
CIE-LCH	lch(29.93, 19.36, 13.87°)
OKLab	oklab(40.32% 0.057 0.0122)
OKLCH	oklch(40.32% 0.058 12.1)
XYZ	xyz(7.7452, 6.2080, 5.6398)
Luminance	0.0621 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643B40 #3B645F

analogous

#643B54 #643B40 #644A3B

triadic

#643B40 #40643B #3B4064

tetradic

#643B40 #54643B #3B645F #4A3B64

square

#643B40 #54643B #3B645F #4A3B64

split-complementary

#643B40 #3B644A #3B5464

monochromatic

#170E0F #3E2427 #643B40 #8A5259 #AA6F76

Accessibility & contrast

On white

9.37

#643B40 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.24

#643B40 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643B40

9.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643B40	#FFFFFF	#000000	##FFFFFF
##643B40	1.00	9.37	2.24	9.37
#FFFFFF	9.37	1.00	21.00	1.00
#000000	2.24	21.00	1.00	21.00
##FFFFFF	9.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#424240

Deuteranopia (green-blind)

#4C493F

Tritanopia (blue-blind)

#6B373D

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643b40;
/* rgb */ color: rgb(100, 59, 64);
/* oklch */ color: oklch(40.3% 0.058 12.1);

Tailwind

colors: {
  custom: {
    50: '#927174',
    500: '#643b40',
    950: '#000000',
  },
}

SCSS

$custom: #643b40;
$custom-light: #927174;
$custom-dark: #000000;

JSON

{
  "hex": "#643b40",
  "rgb": {
    "r": 100,
    "g": 59,
    "b": 64
  },
  "hsl": {
    "h": 352.683,
    "s": 25.786,
    "l": 31.176
  },
  "oklch": {
    "l": 0.40318,
    "c": 0.05829,
    "h": 12.1
  },
  "luminance": 0.06207
}

Semantic roles & 50–950 ramp

primary

#643B40

secondary

#67948F

accent

#C2B766

background

#F9F6F7

surface

#F1ECED

border

#CBC7C8

text

#0D0808

muted

#7E7B7B

Preview Lab

Preview with #643B40

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

Preview Lab → · Contrast checker → · Palette generator →