Smartphone users who opted for a transparent case to show off the tech design may have noticed the clear plastic has turned a dingy yellow.While the change might be annoying, the truth is that the plastic used to make these covers is actually yellow - but manufacturers add a blue tint that makes them see-through.The tint wears off exposing the original color when the case is exposed to ultraviolet (UV) light, natural oils, and sweat from the human body.
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