Imperial Lilac

#a99fcf

A violet that is nearly neutral — the hue shows only against a true grey. It is light — black text sits on it comfortably, white text does not.

Hex

#a99fcf

RGB

169, 159, 207

OKLCh

72.8% 0.070 294.2°

CIELAB (D50)

67.6, 11.1, -23.3

What is true of this colour, and of no other

3 other named colours sit within ΔE00 2 of it.
It uses 44% of the chroma sRGB can show at this lightness and hue.
As text on white it measures APCA Lc 48.3; on black, Lc -53.7. 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.
tritanopia shifts it by ΔE00 9.3 — no blue cone.

Text on this colour

White text

2.46:1 — fails AA

Black text

8.55:1 — passes AA

Black text is the better of the two at8.55:1. That is enough for body text.

As text on white, it needs to change

#7a719e 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

#a99fcf

protanopia

#a0a0cf · ΔE00 3.4

deuteranopia

#a2a2cf · ΔE00 3.2

tritanopia

#a4a4b7 · ΔE00 9.3

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isPuturple at ΔE00 1.57: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.

PuturpleΔE00 1.57 · #ada2ce
Milky LavenderΔE00 1.576 · #aea3d0
Purple VisionΔE00 1.841 · #a29cc8
WistfulΔE00 2.085 · #a29ecd
Grape ArbourΔE00 2.244 · #a598c7
Ariel’s DelightΔE00 2.348 · #b2a5d3
Cosmo PurpleΔE00 2.372 · #a09bc6
BloomsberryΔE00 2.666 · #a598c4
Grape IllusionΔE00 2.726 · #b4a6d5
Simply VioletΔE00 2.771 · #a6a1d7
May MistΔE00 2.825 · #a19fc8
Purple RoseΔE00 2.92 · #af9fca

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