Skies of Mars

Was watching a show today about Mars and they said the pressure on Mars was equal to the Earth at 100,000ft.

If that is true, why does it has a sky? On earth when you get to the same pressure level that is on Mars the sky is black. In fact, the sky goes black at 50,000ft. You look up and there is no blue.

So why does the sky on Mars look a pale blue? Seems to me someone is lying. Why that would be I do not know. But I do know that when the air is that rarified it becomes see through as in no color.

Has anyone thought of this before?