Correcting powder made of silicon carbide granulate for levelling/straightening and cleaning of grinding stones. Both natural and synthetic whetstones become hollow on the working surface over time during sharpening, resulting in an inward curvature. Correcting powder is used to create or maintain a flat/straight surface. The correcting powder is suitable for Japanese water stones with a grain size of 2000 and above as well as soft-bonded natural stones (e.g. Belgian Chunk/Coticule). Not suitable for artificial ceramic stones, Arkansas stones and diamond grinding plates. Apply a small amount of the powder to a hard and smooth surface, e.g. a thick safety glass pane, a polished marble or granite slab. Moisten the powder with water. Now rub the whetstone you want to plane with circular movements against the base moistened with powder until the desired result is achieved. Supplied in a plastic bottle with 230 g powder.