HueComb

Underground

#665a51

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

#665a51

RGB

102, 90, 81

OKLCh

47.6% 0.021 59.1°

CIELAB (D50)

39.2, 3.8, 7.1

What is true of this colour, and of no other

  • 12 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 19% 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 83.0; on black, Lc -19.0. 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 7.4 and 7.9 and 20.4 — no red cone.

Text on this colour

White text

6.67:1 — passes AA

Black text

3.15:1 — large text only

White text is the better of the two at6.67:1. That is enough for body text.

The same colour, with one cone missing

As you see it

#665a51

protanopia

#5b5b51 · ΔE00 7.4

deuteranopia

#5e5e51 · ΔE00 7.9

tritanopia

#606000 · ΔE00 20.4

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isIntrigue at ΔE00 1.163: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.

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