Fibonacci Blue
#112358
A blue that is muted. It is dark — it carries white text and needs care with black.
Hex
#112358
RGB
17, 35, 88
OKLCh
27.8% 0.099 265.9°
CIELAB (D50)
15.1, 9.8, -34.9
What is true of this colour, and of no other
- 2 other named colours sit within ΔE00 2 of it.
- It uses 52% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 101.5; 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.
- 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
14.94:1 — passes AA
Black text
1.41:1 — fails AA
White text is the better of the two at14.94:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#112358
protanopia
#212158 · ΔE00 4.0
deuteranopia
#1f1f58 · ΔE00 4.0
tritanopia
#1b1b65 · ΔE00 4.7
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isDark Soul at ΔE00 0.551: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Dark SoulΔE00 0.551 · #112255
- DownriverΔE00 1.064 · #092256
- Schiava BlueΔE00 2.028 · #192961
- Black Sea NightΔE00 2.206 · #052462
- ClarinetΔE00 2.296 · #002255
- SubnauticalΔE00 2.32 · #012253
- Pure MidnightΔE00 2.394 · #112266
- Deep SapphireΔE00 2.45 · #082466
- Ultramarine VioletΔE00 2.527 · #1d2a58
- Dark SapphireΔE00 2.636 · #082567
- Midnight MelancholiaΔE00 2.794 · #002266
- Abyssal DepthsΔE00 2.812 · #10246a
7 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.