Noble Red
#92181d
A red that is saturated. It is mid — the hardest range to put text on, either colour struggles.
Hex
#92181d
RGB
146, 24, 29
OKLCh
42.8% 0.156 25.3°
CIELAB (D50)
32.1, 49.5, 31.9
What is true of this colour, and of no other
- 11 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 90% of the chroma sRGB can show at this lightness and hue — close enough to the boundary that a wider display would show it slightly more vividly.
- As text on white it measures APCA Lc 88.7; on black, Lc -13.5. 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 31.9 and 37.1 and 41.5 — no red cone.
Text on this colour
White text
8.86:1 — passes AA
Black text
2.37:1 — fails AA
White text is the better of the two at8.86:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#92181d
protanopia
#39391f · ΔE00 31.9
deuteranopia
#555512 · ΔE00 37.1
tritanopia
#6b6b00 · ΔE00 41.5
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isSocialist at ΔE00 0.583: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- SocialistΔE00 0.583 · #921a1c
- Classy RedΔE00 0.961 · #911f21
- Quite RedΔE00 0.966 · #97171e
- Sacred ScarletΔE00 1.028 · #950c1b
- ShinshuΔE00 1.171 · #8f1d21
- Flame HawkfishΔE00 1.652 · #960018
- Old MandarinΔE00 1.671 · #8e2323
- Heidelberg RedΔE00 1.671 · #960117
- Ruby RedΔE00 1.71 · #9b111e
- EstrorubyΔE00 1.805 · #9b101f
- Nigritella RedΔE00 1.972 · #931121
- Vivid AuburnΔE00 2.055 · #922724
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.