Dear Apple and guys,
Don't buy any Apple Silicon Case from Apple.
Last month i purchased one Silicone Case (White) for my Iphone X.
It's been 35 days case become Yellow.
As Apple always proud their products but the way they show actually it's not. I am really disappointed and i ask for exchange they said not exchangeable. They are charging 70$ 75$ ***.
iPhone X
If you have an Apple Store near you I would suggest you set up an Appointment at the Genius Bar and take your iPhone and Case in for them to look at. Guessing they will give you a few options. - http://www.apple.com/retail/geniusbar/
It probably is not turning yellow it picked up that color from being in contact with something. I am assuming you already tried soap and water, next thing to try is a Mr. Clean Magic Eraser.
Apple Silicon Case (White) Become yellow
