Twilight Express
#1c3378
A blue that is muted. It is dark — it carries white text and needs care with black.
Hex
#1c3378
RGB
28, 51, 120
OKLCh
34.8% 0.121 266.2°
CIELAB (D50)
22.9, 11.9, -43.0
What is true of this colour, and of no other
- 5 other named colours sit within ΔE00 2 of it.
- It uses 52% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 96.5; 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.
- tritanopia shifts it by ΔE00 5.4 — no blue cone.
Text on this colour
White text
11.70:1 — passes AA
Black text
1.79:1 — fails AA
White text is the better of the two at11.70:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#1c3378
protanopia
#313178 · ΔE00 4.7
deuteranopia
#2e2e78 · ΔE00 4.7
tritanopia
#29298a · ΔE00 5.4
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isBavarian Blue at ΔE00 1.36: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Bavarian BlueΔE00 1.36 · #1c3382
- Surf the WebΔE00 1.432 · #20377f
- Deep Space RoyalΔE00 1.721 · #223382
- Below the SurfaceΔE00 1.875 · #0a2f7c
- Atlantic NavyΔE00 1.911 · #13336f
- Migol BlueΔE00 2.371 · #283482
- Passionate BlueΔE00 2.772 · #1f3465
- Blue Jinn’sΔE00 2.801 · #002d72
- Catalina BlueΔE00 2.826 · #062a78
- Intergalactic HighwayΔE00 2.959 · #273287
- One Minute to MidnightΔE00 2.974 · #003388
- Dark Midnight BlueΔE00 3.01 · #003377
7 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.