Sub-Zero
#57a1ce
A blue that is muted. It is light — black text sits on it comfortably, white text does not.
Hex
#57a1ce
RGB
87, 161, 206
OKLCh
67.9% 0.100 237.4°
CIELAB (D50)
62.9, -13.9, -30.6
What is true of this colour, and of no other
- 5 other named colours sit within ΔE00 2 of it.
- It uses 67% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 54.3; on black, Lc -47.5. 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 18.7 and 17.8 and 16.4 — no red cone.
Text on this colour
White text
2.84:1 — fails AA
Black text
7.39:1 — passes AA
Black text is the better of the two at7.39:1. That is enough for body text.
As text on white, it needs to change
#327ea9 is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved.
The same colour, with one cone missing
As you see it
#57a1ce
protanopia
#9b9bce · ΔE00 18.7
deuteranopia
#9090cf · ΔE00 17.8
tritanopia
#8383ff · ΔE00 16.4
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isPicton Blue at ΔE00 1.264: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.
- Picton BlueΔE00 1.264 · #5ba0d0
- Alaskan BlueΔE00 1.417 · #61a4ce
- Peaceful RiverΔE00 1.629 · #47a0d2
- Blue IguanaΔE00 1.735 · #539ccc
- First LandingΔE00 1.928 · #59a6cf
- Ethereal BlueΔE00 2.003 · #5ca6ce
- Blue GrottoΔE00 2.041 · #50a2ca
- Waimea BlueΔE00 2.052 · #4ca2d9
- Blue AstroΔE00 2.114 · #50a7d9
- Water SpiritΔE00 2.499 · #65a5d5
- Canadian TuxedoΔE00 2.499 · #579aca
- CousteauΔE00 2.516 · #55a9d6
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.