It clearly states "System.Drawing.Color Structure", i.e. no namespace. This means that you cannot do something like "using System.Drawing.Color;" in C #.
For all your color needs in iOS, you need to use MonoTouch.UIKit.UIColor , the type that MonoTouch uses in most cases (for example, all UIKit APIs).
I'm not sure about Android, but I think you need to use Android.Graphics.Color
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