HueComb

Shades of Ruby

#9c0009

A red that is saturated. It is mid — the hardest range to put text on, either colour struggles.

Hex

#9c0009

RGB

156, 0, 9

OKLCh

43.5% 0.178 27.8°

CIELAB (D50)

32.7, 56.1, 44.0

What is true of this colour, and of no other

  • 15 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 sits exactly on the sRGB boundary: at this lightness and hue the gamut has nothing left, and a wider display would show a more colourful version of it.
  • As text on white it measures APCA Lc 87.2; on black, Lc -14.9. 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 35.1 and 38.7 and 42.2 — no red cone.

Text on this colour

White text

8.69:1 — passes AA

Black text

2.42:1 — fails AA

White text is the better of the two at8.69:1. That is enough for body text.

The same colour, with one cone missing

As you see it

#9c0009

protanopia

#36360d · ΔE00 35.1

deuteranopia

#585800 · ΔE00 38.7

tritanopia

#717100 · ΔE00 42.2

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isNoble Cause at ΔE00 0.796: below 1.0 — an ordinary observer cannot tell these apart, even side by side. 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.