Kathmandu

#ad9a5d

A yellow that is muted. It is light — black text sits on it comfortably, white text does not.

Hex

#ad9a5d

RGB

173, 154, 93

OKLCh

68.9% 0.084 92.7°

CIELAB (D50)

64.3, 1.0, 34.6

What is true of this colour, and of no other

8 other named colours sit within ΔE00 2 of it.
It uses 59% of the chroma sRGB can show at this lightness and hue.
As text on white it measures APCA Lc 53.5; on black, Lc -48.3. 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 6.4 and 6.4 and 12.0 — no red cone.

Text on this colour

White text

2.78:1 — fails AA

Black text

7.56:1 — passes AA

Black text is the better of the two at7.56:1. That is enough for body text.

As text on white, it needs to change

#887539 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

#ad9a5d

protanopia

#9c9c5d · ΔE00 6.4

deuteranopia

#a0a05c · ΔE00 6.4

tritanopia

#a4a400 · ΔE00 12.0

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isSpring Moss at ΔE00 1.29: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.

Spring MossΔE00 1.29 · #a99757
Pesto di NoceΔE00 1.312 · #b09d64
Mossy RockΔE00 1.472 · #a9965d
Burnished GoldΔE00 1.507 · #aa9855
Whispering GrasslandsΔE00 1.68 · #ac9d64
Shiny GoldΔE00 1.952 · #ae9f65
Antique GoldΔE00 1.964 · #b59e5f
Apple WineΔE00 1.995 · #b59f62
Faded KhakiΔE00 2.104 · #a5975b
Wistman’s WoodΔE00 2.234 · #aa9966
Tallarn SandΔE00 2.368 · #a79b5e
Loveliest LeavesΔE00 2.435 · #a69a5c

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