mm of a touchstone. Therefore, the touchstone with the number 15600 - is a rough bar, suitable for sharpening the blade to burr, and bars with the number 37000 is already possible to grind. We have a gradation in the sizes of abrasive materials on the grain size also exists, but this information indicates only the emery wheel, and if you buy a bar, then such information you do not get. At most, what you can expect it to buy a bar in a box labeled 'TOUCHSTONE for finishing straight razors. " If such a touchstone of a dark gray color, this is the touchstone of the fine. Make such whetstones of natural slates and use them for the last stage of grinding - deburring, that is, the touchstone is not sharpened, and polished. For even more opinions, read materials from John Utendahl.

Lack of stone - soft, so it works quickly, and it is often necessary smooth face (fugovat). When aligning the faces take emery disc solid grains, lower range in a basin of water and grind (rub) on this disk, the touchstone by hand until the touchstone will not disappear 'pit'. Of course, before lapping the touchstone the blade is treated with a coarser stone, which let everyone pick up myself. As a touchstone suit: granite, alabaster (breed, not powder), marble, dense sandstone, from which previously did millstones, annealed in an induction furnace block of fine-grained powder, such whetstones released once used for industrial needs. A method of sharpening. Sharpening the blade start to rough bars, to the entire length of the blade appeared burr - a thin strip of metal that is formed on the cutting edge in the process of grinding, while sharpening the blade on both sides is bent back and forth, but not broken-off.