Midnight Sky
#424753
A neutral that has no useful hue — it reads as a grey. It is dark — it carries white text and needs care with black.
Hex
#424753
RGB
66, 71, 83
OKLCh
39.8% 0.021 267.5°
CIELAB (D50)
30.0, 0.1, -7.9
What is true of this colour, and of no other
- 8 other named colours sit within ΔE00 2 of it.
- It uses only 8% 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 91.5; 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.
- tritanopia shifts it by ΔE00 7.0 — no blue cone.
Text on this colour
White text
9.30:1 — passes AA
Black text
2.26:1 — fails AA
White text is the better of the two at9.30:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#424753
protanopia
#464653 · ΔE00 3.0
deuteranopia
#464653 · ΔE00 3.2
tritanopia
#45455e · ΔE00 7.0
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isDark Crypt at ΔE00 0.919: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Dark CryptΔE00 0.919 · #3f4551
- Blue AshΔE00 1.052 · #414654
- Meteorite Black BlueΔE00 1.391 · #414756
- Soft SteelΔE00 1.613 · #404854
- Bank BlueΔE00 1.693 · #3e4652
- Pit StopΔE00 1.803 · #414958
- Sea MarinerΔE00 1.959 · #434a54
- Whispered SecretΔE00 1.976 · #3f4855
- Blue Sou’westerΔE00 2.018 · #404956
- Midnight SerenadeΔE00 2.022 · #41434e
- RhinoΔE00 2.06 · #3d4653
- Blue SashΔE00 2.188 · #494d58
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.