Martian colors vary around the red oxides and some blues (maybe even some dark purples). Interestingly, the Martian colors I've seen in print, screen and even through a scope are also those opposite each other on a color wheel.

http://www.mauigateway.com/~donjusko/rcwredoxide.htm

The color of Mars is primarily a red oxide. The best and btw natural way to make the red color in paints is with iron oxide.

Interesting how most Martian colors are depicted in this one category:

TODAY'S TRANSLUCENT TO OPAQUE PALETTE PIGMENTS,
needed for their opaqueness and brilliance.

PY35 cadmium Zinc sulfide = Cadmium Yellow Lemon
PT37 cadmium sulfide = Cadmium Yellow Light, Medium
PO20 cadmium sulfo-selenide = Cadmium Orange
PR108 cadmium seleno sulfide = Cadmium Red Light, Medium
PR101 synthetic red iron oxide = Red Oxide
PY42 synthetic yellow iron oxide = Yellow Oxide
PBr7 natural iron oxide, raw and calcined = Sienna and Umber
PB29 silica, aluminium, sulphur complex = Ultramarine Blue
PB28 oxides of cobalt and aluminium = Cobalt Blue
PG17 anhydrous chromium senquioxide = Chromium oxide Green

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Seeing in color may not be the best contributor to a tell-all story of Mars, but I'm sure that seeing in color helps determine if clouds are made up of water-ice or mostly reddish fine dust. :)

I think that photo you posted, Robert is pretty close to the actual colors. Maybe a tad intense and dark, esp. with the blue, but pretty close to the actual hues. A great photo, btw! Thanks for posting it. I love seeing fog and clouds on Mars. lol

Marcia