Sheesh! AKA2000, I certainly cant teach you to read. Again #2 clearly explains damage caused by the particles in low quality grease. Damage from the larger particles does dull the high finish of precision bearing components by impacting the metal surfaces, thus causing pitting that appears to the eye as dulling the shiny finish.
There are many kinds of engineers, Does it really take a Master machinist that has worked in the defense industry for more then 30yrs to explain such a simple thing to you? Even with the documentation you requested, you still dont understand.
You seem to be getting nasty over such a simple thing. I think we won the cold war without your input.
Don