Today, I decided to check my iPhone's liquid sensor, in the headphone jack, just to make sure it's not pink/redish. I took a flashlight and looked inside. It wasn't pink, but I noticed that the left hand side of the white sticker is a little gray-ish. Now I know the white sticker changes its color to pink/red when it is trigerred. However for some reason I'm a little concerned. Is this normal? Or should the whole sticker be all white? I know this is probably a very dumb question, but can someone take a look at their headphone jack, and let me know if they see the same thing? I'd really appreciate it. Thanks.