Thread: Blue/Yellow Belgium? Or a Coticule?

Regarding BBW for bevel setting, they are slower - sometimes much slower - than the coticule with slurry. Some people use the BBW in between using the coticule with slurry and the coticule with water, but in my personal experience, it doesn't offer any advantages. The fastest cutting will always be the yellow coticule with straight slurry, and the best finish will come from the yellow coticule and plain water. The most efficient use is to do your cutting with undiluted slurry, then dilute the slurry to refine the edge, and then finish on plain water; all on the yellow coticule. BBWs are popular with some for knives and other tools. The quarry sells them in part because for every ton of coticule in a vein, there are many tons of BBW. This photo is a good example, the coticule layers are very thin and sparse compared to the main rock, which is BBW.