Deep Indigo
#4c567a
A blue 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
#4c567a
RGB
76, 86, 122
OKLCh
46.0% 0.060 271.9°
CIELAB (D50)
36.9, 3.3, -21.9
What is true of this colour, and of no other
- 5 other named colours sit within ΔE00 2 of it.
- It uses only 20% 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 84.9; on black, Lc -17.1. 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
7.19:1 — passes AA
Black text
2.92:1 — fails AA
White text is the better of the two at7.19:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#4c567a
protanopia
#55557a · ΔE00 4.0
deuteranopia
#53537a · ΔE00 3.9
tritanopia
#51518b · ΔE00 4.4
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isAlpha Centauri at ΔE00 0.887: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Alpha CentauriΔE00 0.887 · #4d5778
- Nyctophobia BlueΔE00 0.922 · #4d587a
- Blue ReviewΔE00 1.299 · #4e5878
- Dark IrisΔE00 1.687 · #4d5a7e
- SteadfastΔE00 1.729 · #4a5777
- Blue IndigoΔE00 2.051 · #535a7c
- MozartΔE00 2.145 · #485480
- DuskΔE00 2.324 · #4e5481
- AstronautΔE00 2.461 · #445172
- Yacht Club BlueΔE00 2.632 · #485783
- MarlinΔE00 2.707 · #515b87
- Coastal FjordΔE00 2.717 · #505d7e
11 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.