Nautilus
#273c5a
A blue that is nearly neutral — the hue shows only against a true grey. It is dark — it carries white text and needs care with black.
Hex
#273c5a
RGB
39, 60, 90
OKLCh
35.3% 0.059 257.3°
CIELAB (D50)
24.7, -1.0, -20.9
What is true of this colour, and of no other
- 2 other named colours sit within ΔE00 2 of it.
- It uses 46% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 95.7; on black, Lc 0.0. 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 8.5 and 8.4 and 7.1 — no red cone.
Text on this colour
White text
11.17:1 — passes AA
Black text
1.88:1 — fails AA
White text is the better of the two at11.17:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#273c5a
protanopia
#3a3a5a · ΔE00 8.5
deuteranopia
#37375a · ΔE00 8.4
tritanopia
#333375 · ΔE00 7.1
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isNavy Peony at ΔE00 1.746: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Navy PeonyΔE00 1.746 · #223a5e
- Midnight SleighΔE00 1.778 · #243a5e
- Academic BlueΔE00 2.132 · #2c3e56
- MadisonΔE00 2.298 · #2d3c54
- Black TurmericΔE00 2.406 · #2c4364
- Sharp BlueΔE00 2.42 · #2b3d54
- Elmer’s EchoΔE00 2.472 · #264066
- Alpine RaceΔE00 2.712 · #234162
- PiΔE00 2.771 · #314159
- Winter SeaΔE00 2.858 · #303e55
- Blue AccoladeΔE00 2.963 · #25415d
- BiscayΔE00 2.972 · #2f3c53
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.