Polished Silver

#c5d1da

A neutral that has no useful hue — it reads as a grey. It is very light — it works as a page background, not as text.

Hex

#c5d1da

RGB

197, 209, 218

OKLCh

85.4% 0.018 240.0°

CIELAB (D50)

83.1, -2.9, -5.9

What is true of this colour, and of no other

33 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 23% 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 25.5; on black, Lc -77.6. 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 5.9 and 6.4 and 13.4 — no red cone.

Text on this colour

White text

1.55:1 — fails AA

Black text

13.51:1 — passes AA

Black text is the better of the two at13.51:1. That is enough for body text.

As text on white, it needs to change

#6d7880 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

#c5d1da

protanopia

#d0d0da · ΔE00 5.9

deuteranopia

#ceceda · ΔE00 6.4

tritanopia

#cbcbf8 · ΔE00 13.4

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isLight Pre School at ΔE00 0.461: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

Light Pre SchoolΔE00 0.461 · #c5d0d9
Velvet SkyΔE00 0.886 · #c5d3dd
Wind WeaverΔE00 0.911 · #c5d1d8
Illusion BlueΔE00 0.964 · #c3ced8
Tinsel BeamΔE00 1.055 · #c3d1d9
Memory LaneΔE00 1.082 · #c7d1db
Serene SettingΔE00 1.116 · #c5d2d9
NearsightedΔE00 1.128 · #c8d5dd
Light StargateΔE00 1.139 · #c7d2dd
Sentimental LadyΔE00 1.256 · #c4d3dc
Heaven Sent StormΔE00 1.261 · #cad6de
Siberian IceΔE00 1.347 · #c1ccd6

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