#511B1F#511B1F

#511B1F is a dark, moderate red. Relative luminance 0.026; OKLCH L 30.7% C 0.081 H 18.8°. Best body text is #FFFFFF at 13.76:1 contrast (WCAG AA passes).

Color values

HEX	#511B1F
RGB	rgb(81, 27, 31)
HSL	hsl(356, 50%, 21%)
HSV	hsv(356, 67%, 32%)
CMYK	cmyk(0%, 66.7%, 61.7%, 68.2%)
CIE-LAB	lab(18.51, 25.65, 10.59)
CIE-LCH	lch(18.51, 27.75, 22.44°)
OKLab	oklab(30.74% 0.0766 0.0262)
OKLCH	oklch(30.74% 0.081 18.8)
XYZ	xyz(4.0329, 2.6326, 1.5918)
Luminance	0.0263 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#511B1F #1B514D

analogous

#511B3A #511B1F #51321B

triadic

#511B1F #1F511B #1B1F51

tetradic

#511B1F #3A511B #1B514D #321B51

square

#511B1F #3A511B #1B514D #321B51

split-complementary

#511B1F #1B5132 #1B3A51

monochromatic

#170809 #230C0D #511B1F #7F2A31 #AD3A42

Accessibility & contrast

On white

13.76

#511B1F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.53

#511B1F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #511B1F

13.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##511B1F	#FFFFFF	#000000	##FFFFFF
##511B1F	1.00	13.76	1.53	13.76
#FFFFFF	13.76	1.00	21.00	1.00
#000000	1.53	21.00	1.00	21.00
##FFFFFF	13.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#28261F

Deuteranopia (green-blind)

#36311E

Tritanopia (blue-blind)

#59111D

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #511b1f;
/* rgb */ color: rgb(81, 27, 31);
/* oklch */ color: oklch(30.7% 0.081 18.8);

Tailwind

colors: {
  custom: {
    50: '#865a5a',
    500: '#511b1f',
    950: '#000000',
  },
}

SCSS

$custom: #511b1f;
$custom-light: #865a5a;
$custom-dark: #000000;

JSON

{
  "hex": "#511b1f",
  "rgb": {
    "r": 81,
    "g": 27,
    "b": 31
  },
  "hsl": {
    "h": 355.556,
    "s": 50,
    "l": 21.176
  },
  "oklch": {
    "l": 0.3074,
    "c": 0.08098,
    "h": 18.8
  },
  "luminance": 0.02632
}

Semantic roles & 50–950 ramp

primary

#511B1F

secondary

#418782

accent

#DACF4E

background

#F8F5F5

surface

#F0E9E9

border

#CBC5C5

text

#0C0403

muted

#7D7978

Preview Lab

Preview with #511B1F

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

Preview Lab → · Contrast checker → · Palette generator →