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Black stain after polishing

Hi, i would like to know how to take off the black stain an object after polishing it?...whay exactly causes it?

My teachers tell me that we have to sandpaper the object a lot in order to get rid of it...is that true? ,i mean, because i do sandpaper my objects a lot and after polishing with the polishing motor, the stain appears and even moves all over the piece.

Thanks for any help.

Re: Black stain after polishing

Sorry, what i mean with sandpaper is emery paper...thanks!