#641B1B#641B1B

#641B1B is a dark, moderate red. Relative luminance 0.036; OKLCH L 34.2% C 0.105 H 24.6°. Best body text is #FFFFFF at 12.25:1 contrast (WCAG AA passes).

Color values

HEX	#641B1B
RGB	rgb(100, 27, 27)
HSL	hsl(0, 57%, 25%)
HSV	hsv(0, 73%, 39%)
CMYK	cmyk(0%, 73%, 73%, 60.8%)
CIE-LAB	lab(22.21, 32.68, 18.81)
CIE-LCH	lch(22.21, 37.71, 29.93°)
OKLab	oklab(34.2% 0.0955 0.0437)
OKLCH	oklch(34.2% 0.105 24.6)
XYZ	xyz(5.8459, 3.5732, 1.4186)
Luminance	0.0357 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#641B1B #1B6464

analogous

#641B40 #641B1B #64401B

triadic

#641B1B #1B641B #1B1B64

tetradic

#641B1B #40641B #1B6464 #401B64

square

#641B1B #40641B #1B6464 #401B64

split-complementary

#641B1B #1B6440 #1B4064

monochromatic

#180707 #340E0E #641B1B #942828 #C43535

Accessibility & contrast

On white

12.25

#641B1B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.71

#641B1B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #641B1B

12.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##641B1B	#FFFFFF	#000000	##FFFFFF
##641B1B	1.00	12.25	1.71	12.25
#FFFFFF	12.25	1.00	21.00	1.00
#000000	1.71	21.00	1.00	21.00
##FFFFFF	12.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F2B1A

Deuteranopia (green-blind)

#423B19

Tritanopia (blue-blind)

#6E061C

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #641b1b;
/* rgb */ color: rgb(100, 27, 27);
/* oklch */ color: oklch(34.2% 0.105 24.6);

Tailwind

colors: {
  custom: {
    50: '#965d57',
    500: '#641b1b',
    950: '#000000',
  },
}

SCSS

$custom: #641b1b;
$custom-light: #965d57;
$custom-dark: #000000;

JSON

{
  "hex": "#641b1b",
  "rgb": {
    "r": 100,
    "g": 27,
    "b": 27
  },
  "hsl": {
    "h": 0,
    "s": 57.48,
    "l": 24.902
  },
  "oklch": {
    "l": 0.34197,
    "c": 0.10501,
    "h": 24.6
  },
  "luminance": 0.03572
}

Semantic roles & 50–950 ramp

primary

#641B1B

secondary

#419999

accent

#E1E147

background

#F9F5F5

surface

#F2E9E9

border

#CCC5C5

text

#0E0403

muted

#7E7978

Preview Lab

Preview with #641B1B

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

Preview Lab → · Contrast checker → · Palette generator →