Blue Moon
#3992a8
A cyan that is muted. It is light — black text sits on it comfortably, white text does not.
Hex
#3992a8
RGB
57, 146, 168
OKLCh
61.6% 0.089 217.1°
CIELAB (D50)
56.0, -22.1, -19.9
What is true of this colour, and of no other
- 2 other named colours sit within ΔE00 2 of it.
- It uses 81% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 63.2; on black, Lc -38.5. The sign is the polarity, which the WCAG ratio discards.
- Built into an eleven-step scale, 10 of the 10 adjacent pairs stay ΔE00 2 apart — see the ramp.
- protanopia and deuteranopia and tritanopia shift it by ΔE00 22.9 and 22.5 and 23.7 — no red cone.
Text on this colour
White text
3.59:1 — large text only
Black text
5.85:1 — passes AA
Black text is the better of the two at5.85:1. That is enough for body text.
As text on white, it needs to change
#248197 is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved.
The same colour, with one cone missing
As you see it
#3992a8
protanopia
#8b8ba8 · ΔE00 22.9
deuteranopia
#8080a9 · ΔE00 22.5
tritanopia
#7171ff · ΔE00 23.7
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isWinter Time at ΔE00 1.43: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Winter TimeΔE00 1.43 · #4090a2
- Enchanted WellΔE00 1.766 · #3994af
- ScooterΔE00 2.282 · #308ea0
- Aqua DanceΔE00 2.327 · #3896a7
- Alpine LakeΔE00 2.368 · #4598ab
- Cape PondΔE00 2.505 · #0092ad
- Kelp’thar Forest BlueΔE00 2.572 · #0092ae
- PelorusΔE00 2.628 · #2599b2
- Tropical LagoonΔE00 2.697 · #1e98ae
- ZeftronΔE00 2.837 · #0090ad
- Aegean SeaΔE00 2.87 · #508fa2
- Rainy MoodΔE00 2.921 · #4499aa
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.