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If you used a chemical to take off the black anodizing and then polished the aluminum, this is what you would get. I thought about it the day I got the new phone, but dont have the balls to do it. Maybe once the novelity of how new and good it looks wears off, or I get a few nice chips or scratches, I will start looking into the process and actually give it a shot.
 
If you have a white iPhone, you can get little stickers for the top and bottom glass to make it look like that...
 
That's actually a prototype white iPhone 5. Supposedly an early prototype with white front panel and untinted metal backing (seen on the white iPhone) but with black glass at the top and bottom.
 
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