charred cloth. Take old worn out jeans and cut them into 3 to 6 inch squares light them on fire one at a time and deposit them in a tin (I use altoids can) and let them burn out inside with no air. when removed it is the perfect place to aim your spark, from there put it in a nest of small very burnable tinder, ie. a birds nest, or dried grasses bundled and blow very carefully. Takes a fair amount of practice. but definately works in a pinch.