Dark Blue
#315b7d
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
#315b7d
RGB
49, 91, 125
OKLCh
45.6% 0.073 244.8°
CIELAB (D50)
36.8, -6.8, -24.0
What is true of this colour, and of no other
- 8 other named colours sit within ΔE00 2 of it.
- It uses 64% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 84.8; on black, Lc -17.2. 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 13.9 and 13.2 and 10.5 — no red cone.
Text on this colour
White text
7.18:1 — passes AA
Black text
2.92:1 — fails AA
White text is the better of the two at7.18:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#315b7d
protanopia
#57577d · ΔE00 13.9
deuteranopia
#51517d · ΔE00 13.2
tritanopia
#4a4aaf · ΔE00 10.5
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isMatisse at ΔE00 0.856: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- MatisseΔE00 0.856 · #365c7d
- Tidal WaveΔE00 1.269 · #355978
- Venice BlueΔE00 1.469 · #2c5778
- BlueyΔE00 1.599 · #375978
- PelagicΔE00 1.627 · #355d83
- Bahama BlueΔE00 1.693 · #25597f
- Royal BreezeΔE00 1.836 · #275779
- Chinese PorcelainΔE00 1.924 · #3a5f7d
- Breonne BlueΔE00 2.113 · #2d567c
- Queen of the NightΔE00 2.123 · #295776
- Heavy BlueΔE00 2.188 · #2c5674
- Water ChiΔE00 2.256 · #355873
12 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.