#1F0000#1F0000

#1F0000 is a very dark, moderate red. Relative luminance 0.003; OKLCH L 15.0% C 0.062 H 29.2°. Best body text is #FFFFFF at 19.85:1 contrast (WCAG AA passes).

Color values

HEX	#1F0000
RGB	rgb(31, 0, 0)
HSL	hsl(0, 100%, 6%)
HSV	hsv(0, 100%, 12%)
CMYK	cmyk(0%, 100%, 100%, 87.8%)
CIE-LAB	lab(2.63, 11.81, 4.16)
CIE-LCH	lch(2.63, 12.52, 19.41°)
OKLab	oklab(15.03% 0.0538 0.0301)
OKLCH	oklch(15.03% 0.062 29.2)
XYZ	xyz(0.5652, 0.2914, 0.0265)
Luminance	0.0029 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F0000 #001F1F

analogous

#1F000F #1F0000 #1F0F00

triadic

#1F0000 #001F00 #00001F

tetradic

#1F0000 #0F1F00 #001F1F #0F001F

square

#1F0000 #0F1F00 #001F1F #0F001F

split-complementary

#1F0000 #001F0F #000F1F

monochromatic

#1F0000 #1F0000 #1F0000 #5C0000 #990000

Accessibility & contrast

On white

19.85

#1F0000 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.06

#1F0000 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F0000

19.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F0000	#FFFFFF	#000000	##FFFFFF
##1F0000	1.00	19.85	1.06	19.85
#FFFFFF	19.85	1.00	21.00	1.00
#000000	1.06	21.00	1.00	21.00
##FFFFFF	19.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#070500

Deuteranopia (green-blind)

#100C00

Tritanopia (blue-blind)

#230000

Achromatopsia (no color)

#0A0A0A

Design tokens & code

CSS

--color: #1f0000;
/* rgb */ color: rgb(31, 0, 0);
/* oklch */ color: oklch(15.0% 0.062 29.2);

Tailwind

colors: {
  custom: {
    50: '#5a4647',
    500: '#1f0000',
    950: '#000000',
  },
}

SCSS

$custom: #1f0000;
$custom-light: #5a4647;
$custom-dark: #000000;

JSON

{
  "hex": "#1f0000",
  "rgb": {
    "r": 31,
    "g": 0,
    "b": 0
  },
  "hsl": {
    "h": 0,
    "s": 100,
    "l": 6.078
  },
  "oklch": {
    "l": 0.15026,
    "c": 0.06166,
    "h": 29.2
  },
  "luminance": 0.00291
}

Semantic roles & 50–950 ramp

primary

#1F0000

secondary

#126868

accent

#FFFF29

background

#F5F3F3

surface

#E9E5E5

border

#C5C1C1

text

#040000

muted

#797777

Preview Lab

Preview with #1F0000

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

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