Originally Posted by mcguyver
Sure, why not a powder coating, or perhaps a thin wax? Something that would be transferable in the event of an impact. It would be a lasting indicator that could be viewed from multiple angles and without the need for high-speed imaging of a fixed position.
I think that any addition to the BB would affect or even negate the effect of the hop-up on the BBs.
multiple slow motion cams would show any impact and effects IMO.