I almost forgot to add that I was very impressed with cotton balls and petrolium jelly as a tinder. We tried it at our campout last weekend. I even screwed up by using synthetic "fluff" balls instead of cotton. I'm sure 100% cotton would ignite easier. <br><br>I'm going to get some of the real thing, impregnate them with a thin coating of jelly and prefiled magnesium. Then stuff a bunch into an empty 35mm film canister.<br><br>Does anyone know if there's a problem or hazard with preloading the balls with magnesium and carrying them aound?