Whispering Frost

#d7e5d8

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

#d7e5d8

RGB

215, 229, 216

OKLCh

90.8% 0.023 147.4°

CIELAB (D50)

89.6, -6.6, 4.7

What is true of this colour, and of no other

30 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 13% 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 15.1; on black, Lc -88.6. 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 6.2 and 6.5 and 19.9 — no red cone.

Text on this colour

White text

1.31:1 — fails AA

Black text

16.09:1 — passes AA

Black text is the better of the two at16.09:1. That is enough for body text.

As text on white, it needs to change

#6d7a6e 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

#d7e5d8

protanopia

#e3e3d8 · ΔE00 6.2

deuteranopia

#e1e1d8 · ΔE00 6.5

tritanopia

#dedeff · ΔE00 19.9

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isLight Dry Lichen at ΔE00 0.741: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

Light Dry LichenΔE00 0.741 · #d4e3d7
Toadstool DotΔE00 0.833 · #d7e7da
Tint of GreenΔE00 0.913 · #dae9dc
Misty MarshΔE00 0.996 · #d3e1d3
Minty DelightΔE00 1.091 · #d2e2d5
Light MystifiedΔE00 1.185 · #d6e4d4
Green MirrorΔE00 1.3 · #d7e2d5
BathΔE00 1.37 · #d8e9db
River MistΔE00 1.403 · #d6e1d4
Sage SaltΔE00 1.43 · #dbebde
Frozen GrassΔE00 1.483 · #deeadc
Light Green WashΔE00 1.5 · #d4e6d9

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