Any aluminum product may scratch or chip with use, exposing its natural silver color. That is normal.
According to 9to5 site, they received an email exchange from a reader to Phil Schiller where the Apple Senior Vice President of Marketing gives his take on the small amount of scratches and chips that Black iPhone 5 users have experienced.
The reader noted that his black iPhone 5 was suffering some ‘scuffs, scratches and marks’ around the band (read and watch the full story) and asked if Apple had any plans for fixing the issue. The above message was the answer from Philip Schiller
Anyway, tests of the iPhone 5 shows that the back of the black iPhone 5 scratches much easier than its glass-backed iPhone 4/4S predecessors but the aluminum back stands up to drops a lot better than the glass.
