Twinkle Night
#636ca8
A blue that is muted. It is mid — the hardest range to put text on, either colour struggles.
Hex
#636ca8
RGB
99, 108, 168
OKLCh
55.0% 0.094 276.4°
CIELAB (D50)
46.8, 8.5, -33.7
What is true of this colour, and of no other
- 2 other named colours sit within ΔE00 2 of it.
- It uses only 37% of the chroma available at this lightness and hue — there is a far more vivid version of this colour inside sRGB.
- As text on white it measures APCA Lc 74.2; on black, Lc -27.5. 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
4.95:1 — passes AA
Black text
4.24:1 — large text only
White text is the better of the two at4.95:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#636ca8
protanopia
#6b6ba8 · ΔE00 2.6
deuteranopia
#6969a8 · ΔE00 2.4
tritanopia
#6868b6 · ΔE00 2.7
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isMediaeval at ΔE00 1.637: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- MediaevalΔE00 1.637 · #696db0
- Chalcedony VioletΔE00 1.667 · #6770ae
- Chetwode BlueΔE00 2.077 · #666fb4
- KimberliteΔE00 2.101 · #696fa5
- Loch NessΔE00 2.148 · #5f6db0
- BellflowerΔE00 2.363 · #5d66aa
- Jacaranda JazzΔE00 2.608 · #6c70a9
- Gladiola BlueΔE00 2.82 · #6370b6
- Blue IrisΔE00 2.889 · #6264a6
- Mountain Flower MauveΔE00 2.976 · #6c71a6
- Dusted PeriΔE00 3.067 · #696ba0
- DormitoryΔE00 3.105 · #5d71a9
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.