I am not sure I followed you completely. When referring to "ocean color" do you mean the color of the ocean on the maps shown using Bing or OpenStreet map providers? If this is the case, the Background property does not affect ocean color, because the color of ocean isn't something we can control. It is set on the map tiles provided by Bing or OpenStreet (or someone else).
If you refer to the color which is visible as background when EmptyProvider is in use, then it can be changed using Background property of the RadMap control.
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