Delta Mint

#c5e6cf

A green 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

#c5e6cf

RGB

197, 230, 207

OKLCh

89.5% 0.047 155.0°

CIELAB (D50)

88.4, -14.5, 7.4

What is true of this colour, and of no other

10 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 26% 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 17.0; on black, Lc -86.6. 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 11.9 and 12.4 and 26.1 — no red cone.

Text on this colour

White text

1.35:1 — fails AA

Black text

15.59:1 — passes AA

Black text is the better of the two at15.59:1. That is enough for body text.

As text on white, it needs to change

#607e69 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

#c5e6cf

protanopia

#e3e3cf · ΔE00 11.9

deuteranopia

#ddddd0 · ΔE00 12.4

tritanopia

#d7d7ff · ΔE00 26.1

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isMint Smoothie at ΔE00 0.672: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

Mint SmoothieΔE00 0.672 · #c5e6d1
Granny AppleΔE00 0.967 · #c5e7cd
Glacial Water GreenΔE00 0.971 · #c9ead4
Delicate FrostΔE00 1.283 · #c5ead3
Luna GreenΔE00 1.464 · #c1e0c8
Martian MoonΔE00 1.504 · #c3e9d3
Wintergreen MintΔE00 1.516 · #c6e5ca
Frozen PeaΔE00 1.743 · #c4ead5
Spirited GreenΔE00 1.83 · #bddec7
SpearmintsΔE00 1.982 · #bce3c9
Workout GreenΔE00 2.049 · #bfe6d2
KatsuraΔE00 2.077 · #c9e3cc

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