Honest question here, unrelated to 'scuffGate' or whatever it's been dubbed thus far. I was just curious about the aluminium back of the iPhone 5 and its resistance to corrosion due to sweat. The reason I am curious is because over the years there have been countless threads of people having black pitting on the palm rests of their Apple laptops caused by the sweat of their hands during use. If this is the case, won't this become a huge problem given a phone is something held in your hand for long periods of time? I would hate to drop £700 on a new iPhone and discover 6 months down the line that the back is corroding, and of course Apple will not do anything about it because their warranty doesn't cover 'aesthetic' defects.