To make your char, you’ll need a metal container that is nearly air tight, with just a few small holes made by a punch or nail. Fill the can with the material to be charred, and place it in the center of a campfire for 5 to 6 minutes. Smoke and maybe some flames should begin to jet from the small holes in the container. After three to five minutes, the smoke should almost stop jetting out. At the 5- to 6-minute mark, use a stick to carefully roll the hot container out of the fire and let it sit until it's cool to the touch. Open the box once cool. You’ll see that the char material is black, shrunken, and fragile—but not burned to ash. It should catch sparks well. If not, it was either a poor material to use, or it might need further charring. If it is not yet blackened and fragile, it will definitely need further charring. Try a different material or a hotter fire next time.