I am using Apple original charger all the time to charges my phone, and also my phone didn't heat up like crazy. It just a normal temperature tho. From what i observed, this matter happen mostly for many space grey iphone x above users with apple case. We need an answer!
Like I said, something must’ve caused an interaction with the stainless bands to cause a discoloration/tarnish with the bands or it’s heat transfer. But the fact that it’s on the
bottom of the iPhone, near the speaker grill/charging port indicates to me that that’s where the heat is transferred from the charger, which when stainless exceeds higher temperatures, it starts to show a burnt form or rainbow color pattern. The thing is, your case and the OP of this thread have the same general location of where the discoloration is, and not on the rest of the bands surrounding the iPhone. If there was somebody that specializes in Metallurgy, I’d be willing to believe they would have some feedback as to what would cause that type of discoloration.
[Keep in mind, it may be a reaction with the PVD coating that’s on the space gray caused from the unknown factor, as the regular stainless iPhone does not have a PVD coating either.]
It definitely is a rare issue, because I’ve only read this thread that others are experiencing this.
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....Which you won’t find on here in all liklieness. Also, it seems the OP agree’s heat may have been a contributing factor if you read the beginning of this thread.