Martian Cerulean
#57958b
A cyan that is nearly neutral — the hue shows only against a true grey. It is light — black text sits on it comfortably, white text does not.
Hex
#57958b
RGB
87, 149, 139
OKLCh
62.5% 0.066 182.6°
CIELAB (D50)
57.3, -22.8, -1.3
What is true of this colour, and of no other
- 2 other named colours sit within ΔE00 2 of it.
- It uses 60% of the chroma sRGB can show at this lightness and hue.
- As text on white it measures APCA Lc 62.0; on black, Lc -39.7. 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.
- protanopia and deuteranopia and tritanopia shift it by ΔE00 18.8 and 20.6 and 32.5 — no red cone.
Text on this colour
White text
3.46:1 — large text only
Black text
6.08:1 — passes AA
Black text is the better of the two at6.08:1. That is enough for body text.
As text on white, it needs to change
#438178 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
#57958b
protanopia
#90908b · ΔE00 18.8
deuteranopia
#87878c · ΔE00 20.6
tritanopia
#7b7bf1 · ΔE00 32.5
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isThermal Spring at ΔE00 0.604: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Thermal SpringΔE00 0.604 · #589489
- FiddlerΔE00 0.969 · #5a9589
- Dusty TealΔE00 2.277 · #4c9085
- Green AgateΔE00 2.279 · #52928d
- Goose Pond GreenΔE00 2.485 · #629b92
- Spa GreenΔE00 2.529 · #529182
- Mirage LakeΔE00 2.704 · #4f938f
- Petrol GreenΔE00 2.706 · #549b8c
- LochinvarΔE00 2.768 · #489084
- Treasure IsleΔE00 2.814 · #609d91
- Sea GardenΔE00 2.821 · #568e88
- LagoonΔE00 2.976 · #4b9b93
11 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.