#1B4B59#1B4B59

#1B4B59 is a dark, muted cyan. Relative luminance 0.060; OKLCH L 38.7% C 0.056 H 220.3°. Best body text is #FFFFFF at 9.56:1 contrast (WCAG AA passes).

Color values

HEX	#1B4B59
RGB	rgb(27, 75, 89)
HSL	hsl(194, 53%, 23%)
HSV	hsv(194, 70%, 35%)
CMYK	cmyk(69.7%, 15.7%, 0%, 65.1%)
CIE-LAB	lab(29.38, -11.15, -13.05)
CIE-LCH	lch(29.38, 17.17, 229.48°)
OKLab	oklab(38.67% -0.0428 -0.0363)
OKLCH	oklch(38.67% 0.056 220.3)
XYZ	xyz(4.7705, 5.9859, 10.3532)
Luminance	0.0599 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4B59 #59291B

analogous

#1B5948 #1B4B59 #1B2C59

triadic

#1B4B59 #591B4B #4B591B

tetradic

#1B4B59 #481B59 #59291B #2C591B

square

#1B4B59 #481B59 #59291B #2C591B

split-complementary

#1B4B59 #591B2C #59481B

monochromatic

#071417 #0D232A #1B4B59 #297388 #379AB7

Accessibility & contrast

On white

9.56

#1B4B59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.20

#1B4B59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4B59

9.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4B59	#FFFFFF	#000000	##FFFFFF
##1B4B59	1.00	9.56	2.20	9.56
#FFFFFF	9.56	1.00	21.00	1.00
#000000	2.20	21.00	1.00	21.00
##FFFFFF	9.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#42495A

Deuteranopia (green-blind)

#3A4259

Tritanopia (blue-blind)

#00504F

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #1b4b59;
/* rgb */ color: rgb(27, 75, 89);
/* oklch */ color: oklch(38.7% 0.056 220.3);

Tailwind

colors: {
  custom: {
    50: '#607d88',
    500: '#1b4b59',
    950: '#000000',
  },
}

SCSS

$custom: #1b4b59;
$custom-light: #607d88;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4b59",
  "rgb": {
    "r": 27,
    "g": 75,
    "b": 89
  },
  "hsl": {
    "h": 193.548,
    "s": 53.448,
    "l": 22.745
  },
  "oklch": {
    "l": 0.38669,
    "c": 0.05615,
    "h": 220.3
  },
  "luminance": 0.05986
}

Semantic roles & 50–950 ramp

primary

#1B4B59

secondary

#8F5341

accent

#6C4BDD

background

#F5F7F8

surface

#EAEEEF

border

#C6C9CA

text

#05090B

muted

#797B7C

Preview Lab

Preview with #1B4B59

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

Preview Lab → · Contrast checker → · Palette generator →