I’ve had this pan for several months and use it almost every day. I’ve followed recommended cleaning instructions and the interior of the pan remains unblemished except for the top borders. On the bottom (edges mostly) the black coating has rubbed off which can only be explained to occur when cleaning it in the sink. But it doesn’t explain the removal of black coating on top of the borders that don’t rub against the sink. This hasn’t affected the performance of the pan. It just doesn’t look good. Disregard what looks like a brown cast on the interior photo; it’s a shadow.