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emr5503, what they say on that page is is that alloys with more than 20% magnesium are white and will not polish. Either the people at englishcustompolishing.com are full of it, or your "mag" wheels are made from less than 20% magnesium.
I had a Navy friend that said they used (pure) magnesium to destroy sensitive data in computers in case they needed to abandon them. They would rig up magnesuim (powder?) on top of the computer hard drives, so if they needed to get out quick, they would ignite the magnesium and run. Burning magnesium is really difficult to put out.
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