Red is being used for prototype molding and test molding as it is easier to see any flaws in the mold when the plastic is red rather than black.
Nothing fishy about the red helmet, heck I even got a red Nute Gunray helmet that somehow got away from LEGO and was then purchased by me on net
That should end the discussion on red parts for good
Never had a closer look at my clone helmets, I might eventually, but right now the entire lot is packed and awaiting the sale of my appartment.
As I already replied in post number 2 of this entire topic.