Depths of the Nile
#253f4e
A blue that is nearly neutral — the hue shows only against a true grey. It is dark — it carries white text and needs care with black.
Hex
#253f4e
RGB
37, 63, 78
OKLCh
35.4% 0.041 234.9°
CIELAB (D50)
25.1, -6.7, -12.4
What is true of this colour, and of no other
- 5 other named colours sit within ΔE00 2 of it.
- It uses 55% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 95.5; on black, Lc 0.0. 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 12.2 and 13.0 and 12.6 — no red cone.
Text on this colour
White text
11.05:1 — passes AA
Black text
1.90:1 — fails AA
White text is the better of the two at11.05:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#253f4e
protanopia
#3d3d4e · ΔE00 12.2
deuteranopia
#39394e · ΔE00 13.0
tritanopia
#343473 · ΔE00 12.6
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isBakos Blue at ΔE00 1.353: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Bakos BlueΔE00 1.353 · #273f4b
- TaraweraΔE00 1.605 · #253c48
- Reflecting PondΔE00 1.616 · #234251
- Subterranean RiverΔE00 1.88 · #1f3b4d
- Green VogueΔE00 1.933 · #23414e
- Reef ResortΔE00 2.457 · #274256
- Indigo Go-GoΔE00 2.537 · #234156
- Asurmen Blue WashΔE00 2.586 · #273e51
- Blue Wing TealΔE00 2.636 · #2e4556
- CraftΔE00 2.856 · #293b4a
- Astronaut BlueΔE00 2.932 · #214559
- Black Forest BlueΔE00 3.102 · #29485a
12 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.