Colour
#18403B
- #18403B
- Cyan
- Dark
- Nearest: Dark slate grey
#18403B is a cyan with RGB values 24, 64, 59 and HSL 173°, 45%, 17%. It is a dark colour, so white text on it reaches 11.4:1 contrast (AAA for normal text). The nearest named colour is Dark slate grey.
Colour values
#18403B#18403B
HEX#18403B
RGBrgb(24, 64, 59)
RGB (0–1)0.0941, 0.251, 0.2314
RGB percentages9.4%, 25.1%, 23.1%
HSLhsl(172.5, 45.5%, 17.3%)
HSV / HSBhsv(172.5, 62.5%, 25.1%)
CMYK62.5%, 0%, 7.8%, 74.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,589,307
CSS custom property--colour: #18403B;
Brightness & contrast
Relative luminance0.04177WCAG 2.x, 0 is black and 1 is white
Perceived brightness54.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 11.44:1
Contrast with white11.44:1WCAG normal text: AAA
Contrast with black1.84:1WCAG normal text: Fail
Greyscale equivalent#373737
Inverted#E7BFC4
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text11.44:1WCAG large text: AAA
Contrast with black, large text1.84:1WCAG large text: Fail
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#40181D
Analogous#184027, #183140
Triadic#3B1840, #403B18
Split complementary#401831, #402718
Tetradic#271840, #40181D, #314018
Tints, shades & saturation
Channel breakdown
R24
G64
B59
Red24 (9.4%)
Green64 (25.1%)
Blue59 (23.1%)
Hue172.5°
Saturation (HSL)45.45%
Lightness17.25%
Dominant channelGreen
Hex per channelR 18 · G 40 · B 3B
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