Some of the stuff is awful but there some fine grained material which does take heat well and it really changed the look of the rock both in color and workability. The hafted point was heat treated and came out waxy but brittle, the lighter was hafted but shot it and was intending to re-sharpen it but never got around to it. I have a source for this material now after finding a nice cut in an old decommissioned logging road but no time to collect it when I'm out that way.