Busty Blue
#3300cc
A blue that is about as vivid as sRGB can show at this lightness. It is mid — the hardest range to put text on, either colour struggles.
Hex
#3300cc
RGB
51, 0, 204
OKLCh
40.2% 0.254 274.4°
CIELAB (D50)
24.9, 59.1, -90.6
What is true of this colour, and of no other
- One other named colour sits 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 91.4; on black, Lc -10.9. 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
10.43:1 — passes AA
Black text
2.01:1 — fails AA
White text is the better of the two at10.43:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#3300cc
protanopia
#0c0ccc · ΔE00 2.6
deuteranopia
#1919cc · ΔE00 3.2
tritanopia
#2222bc · ΔE00 4.5
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isInterdimensional Blue at ΔE00 0.951: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Interdimensional BlueΔE00 0.951 · #360ccc
- Galactic HighwayΔE00 2.013 · #3311bb
- Evil EyeΔE00 2.216 · #1100cc
- UltramarineΔE00 2.407 · #1805db
- Medium BlueΔE00 2.654 · #0000cd
- Lady of the SeaΔE00 2.689 · #0000cc
- BluealiciousΔE00 2.811 · #0000dd
- True BlueΔE00 3.013 · #010fcc
- VesperΔE00 3.15 · #0011cc
- Pure BlueΔE00 3.174 · #0203e2
- Indigo BlueΔE00 3.356 · #3a18b1
- Blue Copper OreΔE00 3.508 · #4411dd
9 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.