Royal Night
#2b3191
A blue that is saturated. It is dark — it carries white text and needs care with black.
Hex
#2b3191
RGB
43, 49, 145
OKLCh
37.5% 0.155 273.4°
CIELAB (D50)
25.1, 24.0, -54.9
What is true of this colour, and of no other
- 8 other named colours sit within ΔE00 2 of it.
- It uses 65% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 94.4; on black, Lc -8.2. 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.
- All three dichromacies see it as very nearly the same colour you do: its hue is not the part carrying its identity.
Text on this colour
White text
10.76:1 — passes AA
Black text
1.95:1 — fails AA
White text is the better of the two at10.76:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#2b3191
protanopia
#303091 · ΔE00 1.0
deuteranopia
#2f2f91 · ΔE00 1.1
tritanopia
#2e2e96 · ΔE00 1.4
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isUltramarine Highlight at ΔE00 0.593: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Ultramarine HighlightΔE00 0.593 · #2e328f
- Perfect DarkΔE00 1.019 · #313390
- Depths of NightΔE00 1.381 · #2c319b
- BluebellΔE00 1.597 · #333399
- Intergalactic HighwayΔE00 1.664 · #273287
- Ritterlich BlueΔE00 1.683 · #293286
- Liquid DenimΔE00 1.882 · #2d3796
- North Star BlueΔE00 1.976 · #223399
- Cosmic CobaltΔE00 2.031 · #2e2d88
- Migol BlueΔE00 2.563 · #283482
- Deep Space RoyalΔE00 2.856 · #223382
- Bavarian BlueΔE00 3.487 · #1c3382
6 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.