Frozen Civilization

#e1f5e5

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

#e1f5e5

RGB

225, 245, 229

OKLCh

95.1% 0.030 151.5°

CIELAB (D50)

94.7, -9.0, 5.4

What is true of this colour, and of no other

13 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 37% 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 0.0; on black, Lc -97.9. 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 8.2 and 8.6 and 17.7 — no red cone.

Text on this colour

White text

1.14:1 — fails AA

Black text

18.39:1 — passes AA

Black text is the better of the two at18.39:1. That is enough for body text.

As text on white, it needs to change

#697b6d 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

#e1f5e5

protanopia

#f3f3e5 · ΔE00 8.2

deuteranopia

#efefe5 · ΔE00 8.6

tritanopia

#ebebff · ΔE00 17.7

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isNettle Rash at ΔE00 0.583: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

Nettle RashΔE00 0.583 · #e4f7e7
After Dinner MintΔE00 0.71 · #e3f5e5
Aquarelle GreenΔE00 0.711 · #e2f4e4
Minified MalachiteΔE00 1.158 · #ddf3e5
Particle CannonΔE00 1.275 · #def3e6
Winter MistΔE00 1.313 · #e7fbec
Delicate MintΔE00 1.442 · #ddf3e6
Ice-Cold WhiteΔE00 1.523 · #dff0e2
Sea MistΔE00 1.607 · #dbeee0
Frosted MintΔE00 1.615 · #e2f2e4
Vanishing PointΔE00 1.774 · #ddeedd
Spring DewΔE00 1.909 · #d9eee1

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