HueComb

Bluebell

#333399

A blue that is saturated. It is dark — it carries white text and needs care with black.

Hex

#333399

RGB

51, 51, 153

OKLCh

39.1% 0.162 275.9°

CIELAB (D50)

26.9, 26.6, -57.0

What is true of this colour, and of no other

  • 5 other named colours sit within ΔE00 2 of it.
  • It uses 66% of the chroma sRGB can show at this lightness and hue.
  • As text on white it measures APCA Lc 92.9; on black, Lc -9.5. 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

10.12:1 — passes AA

Black text

2.07:1 — fails AA

White text is the better of the two at10.12:1. That is enough for body text.

The same colour, with one cone missing

As you see it

#333399

protanopia

#333399 · ΔE00 0.0

deuteranopia

#333399 · ΔE00 0.0

tritanopia

#333399 · ΔE00 0.0

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isDepths of Night at ΔE00 1.129: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.

7 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.