It is common for a big camp knife to be heat-treated with hard edge and soft spine (assume it's made of a steel that can be done). My question is, in case of a big figher with false edge at the back, what would a knifemaker do regarding differential-tempering? Is the softer part still along the back of the blade, which means the false edge would not hold an edge as well as the primary age? Or can it be done in a way that gives hard edges for both while having a softer core along the middle?
Thanks in advance.