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Recognised as Colour

#42D7EF

  • #42D7EF
  • Cyan
  • Light
  • Nearest: Dark turquoise

#42D7EF is a cyan with RGB values 66, 215, 239 and HSL 188°, 84%, 60%. It is a light colour, so black text on it reaches 12.2:1 contrast (AAA for normal text). The nearest named colour is Dark turquoise.

Colour values

#42D7EF#42D7EF
HEX#42D7EF
RGBrgb(66, 215, 239)
RGB (0–1)0.2588, 0.8431, 0.9373
RGB percentages25.9%, 84.3%, 93.7%
HSLhsl(188.3, 84.4%, 59.8%)
HSV / HSBhsv(188.3, 72.4%, 93.7%)
CMYK72.4%, 10%, 0%, 6.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer4,380,655
CSS custom property--colour: #42D7EF;

Brightness & contrast

Relative luminance0.55991WCAG 2.x, 0 is black and 1 is white
Perceived brightness186.9 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 12.2:1
Contrast with white1.72:1WCAG normal text: Fail
Contrast with black12.2:1WCAG normal text: AAA
Greyscale equivalent#B9B9B9
Inverted#BD2810

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#C3CFF0no red cones; affects about 1% of men; ΔE 34.2 from the original
Deuteranopia#ABBEEFno green cones; the most common form, about 1% of men; ΔE 35.5 from the original
Tritanopia#00E1DEno blue cones; rare, and affects men and women equally; ΔE 18.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.72:1WCAG large text: Fail
Contrast with black, large text12.2:1WCAG large text: AAA

Named colours

Dark turquoise · ΔE 13.9Sky blue · ΔE 16.2Medium turquoise · ΔE 16.3Light skyblue · ΔE 20.8Aqua · ΔE 22.5Cyan · ΔE 22.5
Nearest named CSS colourDark turquoise (#00CED1)ΔE 13.88, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#EF5A42
Analogous#42EFB1, #4280EF
Triadic#EF42D7, #D7EF42
Split complementary#EF4280, #EFB142
Tetradic#B142EF, #EF5A42, #80EF42

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FEFFFF
Lighter +30%#CFF5FB
Lighter +20%#A0EBF7
Lighter +10%#71E1F3
Darker −10%#14CCEA
Darker −20%#10A3BB
Darker −30%#0C7A8C
Darker −40%#08515D
More saturated +25%#32E3FF
Less saturated −25%#5CC4D5

Channel breakdown

R66
G215
B239
Red66 (25.9%)
Green215 (84.3%)
Blue239 (93.7%)
Hue188.32°
Saturation (HSL)84.39%
Lightness59.8%
Dominant channelBlue
Hex per channelR 42 · G D7 · B EF

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Every value on this page was computed from “42d7ef” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.