Further notes:You need a carbon knife,because the carbon is the actual combustable producing the spark.Are you new to knapping?You need your flintstone and a Hammer(a hard round cobble).Grind a rough face onto your flint.This is your striking surface.Next strike a sharp blow with the hammer.This will produce flakes with the neccessary edge.If glass is available just smash it and you have a flint.this stuff is SHARP! I excavated a Pliestocene Bison kill in Wyoming. In Removing the 7000year old projectile I slit my hand open.With a single molecule edge my wound healed in half the time.Would that Cold Steel could perform as well!!!! <br><br>