Samsung M510 Black Soot

I have a unique situation. My Sprint phone has been giving off this black soot the last two times I have used it on a train for an hour. Everytime I finish a long call, my hand is laced with thick, black, grainy, soot. What the hell is that?! I am concerned. Is it magnets coming from the battery?

---

› See More: Samsung M510 Black Soot

are you sure its not the train thats giving off the soot

Trust, it's not the train giving off the soot. Because this happened twice. The first time, I thought it was maybe I touched something dirty on the train. The second time, thats when I knew it came from that hot cell phone. I am starting to believe the black panel display is the culprit and that it's shedding when heat is applied to it.

it could be the surface of the phone is wearing off