#643B3C#643B3C

#643B3C is a dark, muted red. Relative luminance 0.062; OKLCH L 40.2% C 0.058 H 18.4°. Best body text is #FFFFFF at 9.41:1 contrast (WCAG AA passes).

Color values

HEX	#643B3C
RGB	rgb(100, 59, 60)
HSL	hsl(359, 26%, 31%)
HSV	hsv(359, 41%, 39%)
CMYK	cmyk(0%, 41%, 40%, 60.8%)
CIE-LAB	lab(29.82, 18.23, 7.09)
CIE-LCH	lch(29.82, 19.56, 21.26°)
OKLab	oklab(40.2% 0.0552 0.0184)
OKLCH	oklch(40.2% 0.058 18.4)
XYZ	xyz(7.6354, 6.1641, 5.0617)
Luminance	0.0616 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643B3C #3B6463

analogous

#643B50 #643B3C #644E3B

triadic

#643B3C #3C643B #3B3C64

tetradic

#643B3C #50643B #3B6463 #4E3B64

square

#643B3C #50643B #3B6463 #4E3B64

split-complementary

#643B3C #3B644E #3B5064

monochromatic

#170E0E #3E2425 #643B3C #8A5253 #AA6F71

Accessibility & contrast

On white

9.41

#643B3C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#643B3C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643B3C

9.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643B3C	#FFFFFF	#000000	##FFFFFF
##643B3C	1.00	9.41	2.23	9.41
#FFFFFF	9.41	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#43413C

Deuteranopia (green-blind)

#4D493B

Tritanopia (blue-blind)

#6C363C

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643b3c;
/* rgb */ color: rgb(100, 59, 60);
/* oklch */ color: oklch(40.2% 0.058 18.4);

Tailwind

colors: {
  custom: {
    50: '#927171',
    500: '#643b3c',
    950: '#000000',
  },
}

SCSS

$custom: #643b3c;
$custom-light: #927171;
$custom-dark: #000000;

JSON

{
  "hex": "#643b3c",
  "rgb": {
    "r": 100,
    "g": 59,
    "b": 60
  },
  "hsl": {
    "h": 358.537,
    "s": 25.786,
    "l": 31.176
  },
  "oklch": {
    "l": 0.402,
    "c": 0.05818,
    "h": 18.4
  },
  "luminance": 0.06163
}

Semantic roles & 50–950 ramp

primary

#643B3C

secondary

#679493

accent

#C2C066

background

#F9F6F6

surface

#F1ECEC

border

#CBC7C7

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643B3C

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

Preview Lab → · Contrast checker → · Palette generator →