My eyes may be deceiving me, but it looks like martian skies are showing a strong hint of "blue".
So far no one has accused me of being color-blind,
so take a look at the website yourself:
www.jpl.nasa.gov
Doesn't that near natural-color view of Gusev Crater, and the "Longhorn" rock outcropping, also showing unusually bluish skies overhead?
Granted! You can see that the martian sky still has a strong rusty-colored
tint, but the higher you look above the horizon, the more blue appears.
It's not a stratospheric "navy blue" either; more purplish off-blue.
Lack of dust storms there lately?
Jacob