let the sparks fly?

"There must be some elements that could be coated to one sword that would create sparks when struck by another." The question was asked and while some answered with how to use the physics to cause the effect I gave the chemistry method. I don't suggest that the method should be used in amatuer theatre, nor do I deny that it is dangerous. But hey, if you're deliberately trying to get sparks than you're already running the risk of setting something on fire. To get and use magnesium you'd likely need a licenced pyrotechnics specialist on crew and fire extinguishers on hand. Yes, it is poisonous, I'm not suggesting you lick the blade - and the fighters would probably need to wear gloves (but that would also protect their hands from being accidentally nicked). Yes it's dangerous, I would have thought that to be obvious.