I read a post the other day that mentioned How they made pairing chisels out of planer blades at Williamsburg. This got me thinking... I have some 18" planer knives that are trashed but could still be useful so I kept them. They are high speed steel, which is very brittle, I would like to anneal the tang but the annealing process is seems very drawn out and I wouldnt be able to do just the tang. My plan is to heat the tang to cherry red and then slowly cool it in a bucket of wood ashes overnight. Is there a problem with this or any dangers involved? Thanks for any help.