Poseidon
#143c5d
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
#143c5d
RGB
20, 60, 93
OKLCh
34.6% 0.073 247.0°
CIELAB (D50)
23.9, -4.5, -24.2
What is true of this colour, and of no other
- No other named colour in the set is within ΔE00 2 of it — it stands alone.
- It uses 80% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 96.1; 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 12.3 and 11.9 and 9.8 — no red cone.
Text on this colour
White text
11.45:1 — passes AA
Black text
1.83:1 — fails AA
White text is the better of the two at11.45:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#143c5d
protanopia
#39395d · ΔE00 12.3
deuteranopia
#34345d · ΔE00 11.9
tritanopia
#2d2d82 · ΔE00 9.8
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isBlue Opal at ΔE00 2.118: between 2 and 5 — clearly two colours when compared, easily mistaken from memory. What the numbers mean.
- Blue OpalΔE00 2.118 · #124168
- Sir EdmundΔE00 2.266 · #20415d
- Alpine RaceΔE00 2.547 · #234162
- Gibraltar SeaΔE00 2.574 · #133a54
- Blue AccoladeΔE00 2.721 · #25415d
- Dark Imperial BlueΔE00 2.807 · #00416a
- IntegrityΔE00 2.815 · #233e57
- LucidityΔE00 2.863 · #1e4469
- Indigo DyeΔE00 2.955 · #00416c
- Incremental BlueΔE00 2.962 · #123456
- Night DiveΔE00 2.963 · #003355
- Beyond the StarsΔE00 3.177 · #0a3251
11 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.