Below the Surface
#0a2f7c
A blue that is muted. It is dark — it carries white text and needs care with black.
Hex
#0a2f7c
RGB
10, 47, 124
OKLCh
33.6% 0.137 262.4°
CIELAB (D50)
21.3, 13.9, -48.1
What is true of this colour, and of no other
- 4 other named colours sit within ΔE00 2 of it.
- It uses 85% of the chroma sRGB can show at this lightness and hue — close enough to the boundary that a wider display would show it slightly more vividly.
- 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 5.5 and 5.7 and 6.7 — no red cone.
Text on this colour
White text
12.28:1 — passes AA
Black text
1.71:1 — fails AA
White text is the better of the two at12.28:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#0a2f7c
protanopia
#2c2c7c · ΔE00 5.5
deuteranopia
#28287c · ΔE00 5.7
tritanopia
#222290 · ΔE00 6.7
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isBlue Jinn’s at ΔE00 1.588: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Blue Jinn’sΔE00 1.588 · #002d72
- Catalina BlueΔE00 1.592 · #062a78
- Twilight ExpressΔE00 1.875 · #1c3378
- Bavarian BlueΔE00 1.945 · #1c3382
- One Minute to MidnightΔE00 2.026 · #003388
- Atlantic NavyΔE00 2.189 · #13336f
- Dark Midnight BlueΔE00 2.291 · #003377
- Konjō BlueΔE00 2.32 · #003171
- US Air Force BlueΔE00 2.366 · #00308f
- Deep Space RoyalΔE00 2.697 · #223382
- Surf the WebΔE00 2.703 · #20377f
- Deep Sea DreamΔE00 2.73 · #002d69
8 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.