H₂O

#bfe1e6

A cyan that is nearly neutral — the hue shows only against a true grey. It is very light — it works as a page background, not as text.

Hex

#bfe1e6

RGB

191, 225, 230

OKLCh

88.7% 0.036 207.3°

CIELAB (D50)

87.2, -10.8, -6.4

What is true of this colour, and of no other

40 other named colours sit within ΔE00 2 of it — this part of the space is crowded, and the names here are finer distinctions than most people make.
It uses only 33% of the chroma available at this lightness and hue — there is a far more vivid version of this colour inside sRGB.
As text on white it measures APCA Lc 18.9; on black, Lc -84.6. 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 13.4 and 14.5 and 19.2 — no red cone.

Text on this colour

White text

1.39:1 — fails AA

Black text

15.13:1 — passes AA

Black text is the better of the two at15.13:1. That is enough for body text.

As text on white, it needs to change

#5d7c81 is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved.

Try it against your own background

The same colour, with one cone missing

As you see it

#bfe1e6

protanopia

#dedee6 · ΔE00 13.4

deuteranopia

#d8d8e7 · ΔE00 14.5

tritanopia

#d1d1ff · ΔE00 19.2

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isAquarelle Blue at ΔE00 0.488: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

Aquarelle BlueΔE00 0.488 · #bfe0e4
Light SkywayΔE00 0.576 · #c2e3e8
Minified JadeΔE00 0.632 · #c1e3e9
Ambient LightΔE00 0.652 · #c2e2e7
Right as RainΔE00 0.833 · #c0e1e4
Touched by the SeaΔE00 0.843 · #c3e4e8
La Paz SiestaΔE00 0.973 · #c1e5ea
Infinitesimal BlueΔE00 1.037 · #bddde1
Icy WaterΔE00 1.043 · #bce2e8
KyotoΔE00 1.049 · #bee3ea
Light Daly WatersΔE00 1.07 · #c2e4e7
Disappearing IslandΔE00 1.077 · #bbdee5

12 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.