I originally heard it would be a light blue, and once it turned dark blue (as it soaked up oil after about 100-150 games) it would be time to resurface. Then it'd be light blue again, and you'd get another 50 or so games out of it, then it'd turn dark blue, and you'd resurface again to light blue to get another 25 or so games out of it, then throw it away! Don't know how true that story was, but that's what I read!
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SEMPER FI!