There was a thread posted just recently showing this picture here: www.abovetopsecret.com... The photo is also a few years
old already, but it's a good one none the less.
The blue is caused by high altitude dust scattering the sun light.
But will that exact tinge of blue show up to the Human eye? I know the colors the camera's on the rovers see are not the same as what we would see.
There was a whole thread about it on ATS somewhere. That is, unless this photo hasn't already been color corrected that is then my question is moot.