In part one I charred some punk wood by lighting it and stopping the burning process by smothering it in an air tight tin. I also wanted to try charring material in a tin on the fire much like charcloth is done.
Some of the materials I had along was some Ceder bark, Cattail down and some of the punk wood. All three materials I placed in an Altoids tin on the coals for about three minutes or so, I took it off the coals when the gasses escaping out from under the closed lid would burn for about thirty seconds or so and allowed them to cool.
The finished product in the order above after cooling off.
I was able to strike and catch a spark in all three materials that I charred.While not quite as easy as catching a spark in charcloth it's not that difficult. The technique I used was to hold the steel stationary above the tin or fire box and strike down with the flint throwing the sparks downward into the charred material where it would catch and start to glow. I held my tinder (shredded Ceder bark) against the glowing material and blew on it until it caught and started to burn. Once lit I closed the lid saving it for future use.
Although I didn't try it you could take a piece of charred materiel and place it on the flint to catch a spark in the more traditional manner but I want to experiment more with this method to see if the firebox can be "fed" with small amounts of tinder to be self regenerating.