Night Shift
#2a5c6a
A cyan that is nearly neutral — the hue shows only against a true grey. It is mid — the hardest range to put text on, either colour struggles.
Hex
#2a5c6a
RGB
42, 92, 106
OKLCh
44.6% 0.058 218.7°
CIELAB (D50)
36.1, -14.1, -13.5
What is true of this colour, and of no other
- 2 other named colours sit within ΔE00 2 of it.
- It uses 72% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 85.6; on black, Lc -16.5. 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.
- protanopia and deuteranopia and tritanopia shift it by ΔE00 18.1 and 19.0 and 18.6 — no red cone.
Text on this colour
White text
7.40:1 — passes AA
Black text
2.84:1 — fails AA
White text is the better of the two at7.40:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#2a5c6a
protanopia
#58586a · ΔE00 18.1
deuteranopia
#51516b · ΔE00 19.0
tritanopia
#4848a9 · ΔE00 18.6
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isLegion Blue at ΔE00 1.112: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Legion BlueΔE00 1.112 · #245a6a
- Bright NautilusΔE00 1.847 · #225869
- ExcellenceΔE00 2.084 · #22606e
- Connor’s LakefrontΔE00 2.261 · #175a6c
- Blue CoralΔE00 2.447 · #1d5a6e
- Flowing RiverΔE00 2.464 · #335e6f
- AtlantisΔE00 2.591 · #336172
- Holiday VelvetΔE00 2.598 · #206174
- Petro BlueΔE00 2.686 · #2f5961
- Deep LochΔE00 2.715 · #2e5767
- Deep Blue SeaΔE00 2.723 · #1a5d72
- Under the SeaΔE00 2.739 · #395d68
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.