According to this, both the black and white backs are made of anodized aluminum. It's the inlays that are different. what's the difference between ceramic and pigmented glass? And how does all this play out with scratch resistance?
http://www.apple.com/iphone/design/
Aluminum and Glass Body
The back of iPhone 5 is made of anodized 6000 series aluminum the same material used in Apple notebooks with inlays along the top and bottom made of ceramic glass (on the white and silver model) or pigmented glass (on the black and slate model).
http://www.apple.com/iphone/design/
Aluminum and Glass Body
The back of iPhone 5 is made of anodized 6000 series aluminum the same material used in Apple notebooks with inlays along the top and bottom made of ceramic glass (on the white and silver model) or pigmented glass (on the black and slate model).
That sounds backwards to me.
The black iphone 5 has an Anodized surface, while the white phone does not.
Anodized Aluminum is harder and more scratch resistant then non Anodized.
Therefore the White phone will be more prone to scratching over the Black one.