#4B100B#4B100B

#4B100B is a dark, moderate red. Relative luminance 0.019; OKLCH L 27.7% C 0.090 H 29.0°. Best body text is #FFFFFF at 15.24:1 contrast (WCAG AA passes).

Color values

HEX	#4B100B
RGB	rgb(75, 16, 11)
HSL	hsl(5, 74%, 17%)
HSV	hsv(5, 85%, 29%)
CMYK	cmyk(0%, 78.7%, 85.3%, 70.6%)
CIE-LAB	lab(14.91, 27.36, 18.32)
CIE-LCH	lch(14.91, 32.92, 33.81°)
OKLab	oklab(27.69% 0.0783 0.0434)
OKLCH	oklch(27.69% 0.09 29)
XYZ	xyz(3.1477, 1.8911, 0.5158)
Luminance	0.0189 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4B100B #0B464B

analogous

#4B0B26 #4B100B #4B300B

triadic

#4B100B #0B4B10 #100B4B

tetradic

#4B100B #264B0B #0B464B #300B4B

square

#4B100B #264B0B #0B464B #300B4B

split-complementary

#4B100B #0B4B30 #0B264B

monochromatic

#1B0604 #1B0604 #4B100B #801B13 #B6271B

Accessibility & contrast

On white

15.24

#4B100B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.38

#4B100B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #4B100B

15.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4B100B	#FFFFFF	#000000	##FFFFFF
##4B100B	1.00	15.24	1.38	15.24
#FFFFFF	15.24	1.00	21.00	1.00
#000000	1.38	21.00	1.00	21.00
##FFFFFF	15.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#211D0A

Deuteranopia (green-blind)

#302A09

Tritanopia (blue-blind)

#53000F

Achromatopsia (no color)

#252525

Design tokens & code

CSS

--color: #4b100b;
/* rgb */ color: rgb(75, 16, 11);
/* oklch */ color: oklch(27.7% 0.090 29.0);

Tailwind

colors: {
  custom: {
    50: '#83534b',
    500: '#4b100b',
    950: '#000000',
  },
}

SCSS

$custom: #4b100b;
$custom-light: #83534b;
$custom-dark: #000000;

JSON

{
  "hex": "#4b100b",
  "rgb": {
    "r": 75,
    "g": 16,
    "b": 11
  },
  "hsl": {
    "h": 4.688,
    "s": 74.419,
    "l": 16.863
  },
  "oklch": {
    "l": 0.27692,
    "c": 0.08955,
    "h": 29
  },
  "luminance": 0.01891
}

Semantic roles & 50–950 ramp

primary

#4B100B

secondary

#2B8087

accent

#E2F137

background

#F8F4F4

surface

#F0E7E7

border

#CBC3C3

text

#0C0301

muted

#7D7877

Preview Lab

Preview with #4B100B

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

Preview Lab → · Contrast checker → · Palette generator →