Andromeda Blue
#abcdee
A blue that is nearly neutral — the hue shows only against a true grey. It is very light — it works as a page background, not as text.
Hex
#abcdee
RGB
171, 205, 238
OKLCh
83.5% 0.059 247.8°
CIELAB (D50)
80.7, -6.1, -20.3
What is true of this colour, and of no other
- 4 other named colours sit within ΔE00 2 of it.
- It uses 68% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 28.9; on black, Lc -74.0. 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 12.7 and 12.4 and 10.4 — no red cone.
Text on this colour
White text
1.65:1 — fails AA
Black text
12.70:1 — passes AA
Black text is the better of the two at12.70:1. That is enough for body text.
As text on white, it needs to change
#5a7a98 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
#abcdee
protanopia
#cacaee · ΔE00 12.7
deuteranopia
#c4c4ef · ΔE00 12.4
tritanopia
#bdbdff · ΔE00 10.4
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isAlphabet Blue at ΔE00 0.294: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Alphabet BlueΔE00 0.294 · #abcdef
- Blossom BlueΔE00 0.378 · #aaccee
- Baby BuntingΔE00 0.982 · #abcaea
- Island LightΔE00 1.029 · #a7c9eb
- Baby Blue EyesΔE00 2.094 · #a1caf1
- Blue VeilΔE00 2.106 · #aecbe5
- BreezeΔE00 2.15 · #aec9ea
- FeatherbedΔE00 2.184 · #afcbe5
- Water WashΔE00 2.205 · #acc7e5
- Tropical BlueΔE00 2.275 · #aec9eb
- SailΔE00 2.339 · #a5ceec
- TemplateΔE00 2.632 · #a6c9e3
10 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.