I just read a technical paper on this in a thread somewhere in here. H2O being the # 1 cause of advanced break down with Ultraviolet light right behind. As I recall heat was a close 3rd. I'm just guessing but maybe it will stop. I would also keep it open until the stink goes away at least, as it is the gas releasing from the celluloid that affects the steel. But I am no expert on it.