When you form the tip of a japanese-style war-blade, you cut the steel at a 45-degree angle then hammer the back over to form the tip. Usually, the cut-off piece goes in the bin, but with oroshigane or tamahagane, the material is valuable enough that you can’t do that.
Since that picture, I did a gradient mirror polish, ending on the tip of the fang, and blackened the metal at the top with linseed oil and a torch.
When I made it, I made the tip sharp. Really sharp. Then I realized that would be a pretty stupid thing to wear.