The new iPhone 15 Pro and Pro Max are distinguished, among other things, by a new material for the side border, titanium. This allows in particular increased solidity while reducing the weight of the device. However, users have noticed that fingerprints alter the color of the titanium surface of their iPhone.
Temporary alteration of the color of titanium dixit Apple
Have no fear because this alteration is temporary if we are to believe the Apple support page dedicated to cleaning iPhones. It was recently updated to explain that natural oil on the surface of fingers could temporarily alter the color of titanium. A wipe with a soft, slightly damp cloth is enough to put things back in order. Otherwise, it is always possible to protect your device with a case.