Tardis Blue
#003b6f
A blue that is muted. It is dark — it carries white text and needs care with black.
Hex
#003b6f
RGB
0, 59, 111
OKLCh
35.1% 0.105 252.1°
CIELAB (D50)
24.0, 0.1, -35.6
What is true of this colour, and of no other
- 5 other named colours sit within ΔE00 2 of it.
- It sits exactly on the sRGB boundary: at this lightness and hue the gamut has nothing left, and a wider display would show a more colourful version of it.
- As text on white it measures APCA Lc 95.5; 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.
- protanopia and deuteranopia and tritanopia shift it by ΔE00 10.8 and 10.5 and 10.7 — no red cone.
Text on this colour
White text
11.32:1 — passes AA
Black text
1.86:1 — fails AA
White text is the better of the two at11.32:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#003b6f
protanopia
#37376f · ΔE00 10.8
deuteranopia
#31316f · ΔE00 10.5
tritanopia
#292993 · ΔE00 10.7
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isAteneo Blue at ΔE00 0.449: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Ateneo BlueΔE00 0.449 · #003a6c
- Marine BlueΔE00 1.071 · #01386a
- Lost in SpaceΔE00 1.141 · #03386a
- Ashenvale NightsΔE00 1.643 · #104071
- Azure DragonΔE00 1.838 · #053976
- Epic AdventureΔE00 2.459 · #0e426f
- Aegean BlueΔE00 2.489 · #1b416f
- Twilight BlueΔE00 2.644 · #0a437a
- Bracing BlueΔE00 2.699 · #014182
- Prussian BlueΔE00 2.77 · #003366
- Neptune’s DreamΔE00 2.811 · #003368
- Inoffensive BlueΔE00 2.87 · #114477
9 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.