Abyssal
#404c57
A neutral that has no useful hue — it reads as a grey. It is mid — the hardest range to put text on, either colour struggles.
Hex
#404c57
RGB
64, 76, 87
OKLCh
41.0% 0.024 246.1°
CIELAB (D50)
31.6, -2.8, -8.2
What is true of this colour, and of no other
- 12 other named colours sit within ΔE00 2 of it — this part of the space is crowded, and the names here are finer distinctions than most people make.
- It uses only 23% 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 90.1; on black, Lc -12.2. 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 6.8 and 7.2 and 12.8 — no red cone.
Text on this colour
White text
8.79:1 — passes AA
Black text
2.39:1 — fails AA
White text is the better of the two at8.79:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#404c57
protanopia
#4b4b57 · ΔE00 6.8
deuteranopia
#494957 · ΔE00 7.2
tritanopia
#46466f · ΔE00 12.8
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isDutch Licorice at ΔE00 0.534: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Dutch LicoriceΔE00 0.534 · #404b56
- Dark NightΔE00 0.861 · #404b57
- Club NavyΔE00 0.864 · #3e4a54
- Pacific SpiritΔE00 1.14 · #3c4a56
- PresidentialΔE00 1.199 · #3e4d59
- CavalryΔE00 1.408 · #3f4c5a
- Medium Gunship GreyΔE00 1.432 · #3f4952
- Royal NavyΔE00 1.503 · #45505b
- Deepest SeaΔE00 1.507 · #444d56
- VoltageΔE00 1.531 · #3b4956
- New Navy BlueΔE00 1.564 · #3b4a55
- Blue QuarryΔE00 1.929 · #43505e
12 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.