Acoustic Brown
#766b69
A neutral that has no useful hue — it reads as a grey. It is mid — the hardest range to put text on, either colour struggles.
Hex
#766b69
RGB
118, 107, 105
OKLCh
53.7% 0.014 29.9°
CIELAB (D50)
46.2, 4.2, 2.8
What is true of this colour, and of no other
- 2 other named colours sit within ΔE00 2 of it.
- It uses only 7% 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 75.5; on black, Lc -26.2. 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 7.0 and 20.9 — no red cone.
Text on this colour
White text
5.15:1 — passes AA
Black text
4.08:1 — large text only
White text is the better of the two at5.15:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#766b69
protanopia
#6c6c69 · ΔE00 6.4
deuteranopia
#6e6e69 · ΔE00 7.0
tritanopia
#717137 · ΔE00 20.9
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isWarm Haze at ΔE00 0.99: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Warm HazeΔE00 0.99 · #736967
- Night SkyscraperΔE00 1.023 · #756968
- Eagle EyeΔE00 2.09 · #736665
- Hickory CliffΔE00 2.147 · #7c6e6d
- EmuΔE00 2.207 · #756e6d
- Sultry SpellΔE00 2.273 · #716563
- Chocolate PuddingΔE00 2.325 · #6f6665
- GrapyΔE00 2.467 · #786e70
- Simple SilhouetteΔE00 2.487 · #7a716e
- Mauve MoleΔE00 2.512 · #7d716e
- SophomoreΔE00 2.586 · #7d7170
- ImageryΔE00 2.609 · #7a6e70
12 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.