Thalassa
#53b1ba
A cyan that is muted. It is light — black text sits on it comfortably, white text does not.
Hex
#53b1ba
RGB
83, 177, 186
OKLCh
70.7% 0.089 203.8°
CIELAB (D50)
66.8, -27.0, -13.6
What is true of this colour, and of no other
- 3 other named colours sit within ΔE00 2 of it.
- It uses 74% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 49.0; on black, Lc -52.9. 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 24.0 and 24.5 and 28.1 — no red cone.
Text on this colour
White text
2.51:1 — fails AA
Black text
8.37:1 — passes AA
Black text is the better of the two at8.37:1. That is enough for body text.
As text on white, it needs to change
#19838c 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
#53b1ba
protanopia
#aaaaba · ΔE00 24.0
deuteranopia
#9d9dbb · ΔE00 24.5
tritanopia
#8d8dff · ΔE00 28.1
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isAqueduct at ΔE00 1.504: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- AqueductΔE00 1.504 · #60b3bc
- GlassmithΔE00 1.663 · #46b5c0
- SpearfishΔE00 1.8 · #5fb6bf
- AdonisΔE00 2.23 · #64b5bf
- Glacier LakeΔE00 2.334 · #62b4c0
- Dickie BirdΔE00 2.4 · #60b8be
- AqualogicΔE00 2.467 · #57b7c5
- Finnish FiordΔE00 2.47 · #5db0be
- SussieΔE00 2.521 · #58bac2
- Cave LakeΔE00 2.604 · #52b7c6
- Aqua VerdeΔE00 2.626 · #56b3c3
- Ocean TripΔE00 2.646 · #62aeba
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.