Perfect Dark
#313390
A blue that is muted. It is dark — it carries white text and needs care with black.
Hex
#313390
RGB
49, 51, 144
OKLCh
38.1% 0.150 275.7°
CIELAB (D50)
26.0, 23.5, -52.9
What is true of this colour, and of no other
- 7 other named colours sit within ΔE00 2 of it.
- It uses 63% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 93.8; on black, Lc -8.7. 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
10.46:1 — passes AA
Black text
2.01:1 — fails AA
White text is the better of the two at10.46:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#313390
protanopia
#333390 · ΔE00 0.4
deuteranopia
#323290 · ΔE00 0.4
tritanopia
#323292 · ΔE00 0.5
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isUltramarine Highlight at ΔE00 0.509: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Ultramarine HighlightΔE00 0.509 · #2e328f
- Royal NightΔE00 1.019 · #2b3191
- BluebellΔE00 1.302 · #333399
- Depths of NightΔE00 1.828 · #2c319b
- Ritterlich BlueΔE00 1.871 · #293286
- Liquid DenimΔE00 1.914 · #2d3796
- Cosmic CobaltΔE00 1.994 · #2e2d88
- Intergalactic HighwayΔE00 2.025 · #273287
- Migol BlueΔE00 2.654 · #283482
- North Star BlueΔE00 2.699 · #223399
- Deep Space RoyalΔE00 3.239 · #223382
- Purple CabbageΔE00 3.403 · #3d34a5
6 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.