Imbedded material on black grips-an educated? guess
John & Marvin,
I'm no plastics expert, but I believe that this older generation of plastic probably doesn't contain any fiberous material. Plastics were a relatively new material during this time period, and I think the grips are really a very close relative to bakelite like old radio cabinets.
I think the white that John D. is seeing is the result of abuse (intentional or othewise) that changes the appearance and lightens the color is due to abrasion. Similar to what you would see if you accidentally scratched a new car. resurfacing by waxing or polymers might reduce the abrasion, but it will never be as black (or as dense a color, what ever color they are) as they were originally unless you can get below the damage before resurfacing.
just another of my $0.02
-JS
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