Atlantic Navy
#13336f
A blue that is muted. It is dark — it carries white text and needs care with black.
Hex
#13336f
RGB
19, 51, 111
OKLCh
33.6% 0.111 261.5°
CIELAB (D50)
21.9, 7.4, -38.9
What is true of this colour, and of no other
- 5 other named colours sit within ΔE00 2 of it.
- It uses 74% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 97.3; 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 6.6 and 6.5 and 7.2 — no red cone.
Text on this colour
White text
12.13:1 — passes AA
Black text
1.73:1 — fails AA
White text is the better of the two at12.13:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#13336f
protanopia
#30306f · ΔE00 6.6
deuteranopia
#2c2c6f · ΔE00 6.5
tritanopia
#272786 · ΔE00 7.2
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isFunnel Cloud at ΔE00 1.33: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Funnel CloudΔE00 1.33 · #113366
- Konjō BlueΔE00 1.528 · #003171
- Dark Midnight BlueΔE00 1.739 · #003377
- Twilight ExpressΔE00 1.911 · #1c3378
- Blue Jinn’sΔE00 1.986 · #002d72
- Deep Sea DreamΔE00 2.113 · #002d69
- Below the SurfaceΔE00 2.189 · #0a2f7c
- Passionate BlueΔE00 2.319 · #1f3465
- Cobalt Blue TarantulaΔE00 2.394 · #02367d
- Neptune’s DreamΔE00 2.508 · #003368
- Cool BlackΔE00 2.514 · #002e63
- MarineΔE00 2.603 · #042e60
8 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.