Lost in Time

#9fafbd

A neutral that has no useful hue — it reads as a grey. It is light — black text sits on it comfortably, white text does not.

Hex

#9fafbd

RGB

159, 175, 189

OKLCh

74.6% 0.027 244.5°

CIELAB (D50)

70.5, -3.6, -9.2

What is true of this colour, and of no other

11 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 19% 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 44.3; on black, Lc -57.8. 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 7.8 and 8.3 and 12.7 — no red cone.

Text on this colour

White text

2.25:1 — fails AA

Black text

9.34:1 — passes AA

Black text is the better of the two at9.34:1. That is enough for body text.

As text on white, it needs to change

#6a7986 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

#9fafbd

protanopia

#adadbd · ΔE00 7.8

deuteranopia

#ababbd · ΔE00 8.3

tritanopia

#a7a7e1 · ΔE00 12.7

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isSensitivity at ΔE00 0.524: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

SensitivityΔE00 0.524 · #a1b0be
Petrel Blue GreyΔE00 0.815 · #a0aebc
Blue FogΔE00 1.413 · #9babbb
Urban PigeonΔE00 1.493 · #9dacb7
PeaceΔE00 1.542 · #a2b2bd
How HandsomeΔE00 1.682 · #a0aeb8
Wave GoodbyeΔE00 1.711 · #9aaab6
In the BlueΔE00 1.742 · #9eb0bb
ShowerΔE00 1.743 · #9fadb7
Russian BlueΔE00 1.795 · #9aaebb
ScribeΔE00 1.946 · #9fabb6
Rainy SidewalkΔE00 2.008 · #9bafbb

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