Support BladeForums! Paid memberships don't see ads! I stumbled across an old educational video, detailing a machining process called metal scraping. Using a surface plate, some Prussian Blue, and a series of tools resembling chisels, the machinist could achieve a completely flat surface. The process was also used aesthetically to create an effect called "frosting". It produces a really interesting surface patern. I was wondering if anyone knew of such a finish being used for a knife.