HueComb

Arctic

#648589

A cyan that is nearly neutral — the hue shows only against a true grey. It is mid — the hardest range to put text on, either colour struggles.

Hex

#648589

RGB

100, 133, 137

OKLCh

59.3% 0.038 205.4°

CIELAB (D50)

53.1, -11.3, -6.2

What is true of this colour, and of no other

  • One other named colour sits within ΔE00 2 of it.
  • It uses only 37% 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 67.2; on black, Lc -34.4. 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 13.8 and 15.0 and 21.0 — no red cone.

Text on this colour

White text

3.99:1 — large text only

Black text

5.26:1 — passes AA

Black text is the better of the two at5.26:1. That is enough for body text.

As text on white, it needs to change

#5c7c80 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

#648589

protanopia

#828289 · ΔE00 13.8

deuteranopia

#7c7c8a · ΔE00 15.0

tritanopia

#7676c7 · ΔE00 21.0

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isThundercloud at ΔE00 1.512: 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.