Coticule is one of the best natural sharpening stone or whetstone, used for sharpening fine blades since the roman times, extracted only from one place in the Ardennes mountains of Belgium. It is a one stone sharpening type, up to the finest grit (8000). The amount of water and pressure will determine coarser or finer honing. The honing stone is packaged in a fitted carton box for protection and storage. There are two qualities of yellow Coticule sold: standard and selected, this item is the standard version. The darker underside of the stone is made of slate, it is not for honing, it's purpose is to maintain the rigidity of the more fragile Coticule, they were glued together. Do not attempt to use the darker side for sharpening. This stone must be used only with water, not oil, nor dry. No need to soak a long time prior to sharpening, just apply a small amount of water. After use, store it dry. As a natural stone, quarried and cut to size, there could be variations in color or texture, which does not affect quality. Pictures are non-contractual. Instructions: 1. Place the stone with yellow side upwards on a towel or anti-slip surface. 2. Sprinkle or spray the stone with a small amount of water, be sure water is spread on the entire surface. 3. (Optional) Use another coticule stone to rub and raise a slurry on the surface. 4.Place the blade perpendicular to the stone, flat on it, cutting edge opposite to you and raise slightly at 8° angle (for straight razors keep almost flat). 5. Move forth then back with almost no pressure in a X pattern to allow whole blade to touch the stone. Repeat 10-50 times. 6. After sharpening has ended, rinse the stone with water then wipe it dry before storage. Important notice: Coticule is rather fragile, handle with care. Guarantee does not cover wear and tear, nor damage caused by misuse, abuse or improper maintenance, intentional or accidental.