Flame of Prometheus

#db3c02

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

Hex

#db3c02

RGB

219, 60, 2

OKLCh

59.1% 0.203 35.7°

CIELAB (D50)

50.7, 61.0, 62.8

What is true of this colour, and of no other

  • 4 other named colours sit within ΔE00 2 of it.
  • 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 69.8; on black, Lc -31.9. 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 38.8 and 40.3 and 43.9 — no red cone.

Text on this colour

White text

4.51:1 — passes AA

Black text

4.66:1 — passes AA

Black text is the better of the two at4.66:1. That is enough for body text.

The same colour, with one cone missing

As you see it

#db3c02

protanopia

#61610b · ΔE00 38.8

deuteranopia

#868600 · ΔE00 40.3

tritanopia

#a4a400 · ΔE00 43.9

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isTorii Red at ΔE00 0.538: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

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