FAQ

In this method, an abrasive is mixed with a ceramic binder, pressed under high pressure, and then fired at a high temperature (less than 1300°C).

The most important difference is its high abrasive power.
Also, because it is fired at high temperature, it can be used safely for cleaning things like knives that handle raw food. There is also a big difference in the fact that it is easy to handle and does not deteriorate even if it is left in water, under the hot sun, in cold weather, or when it is exposed to chemicals.

By firing at high temperature, the binder melts and forms a porous structure, allowing the abrasive grains to directly contact the blade.

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Sharpening stones made by the resinoid and magnesia methods are not fired at high temperatures, so not only the abrasive but also the binder comes in contact with the blade.
Therefore, the binder also comes in contact with the blade along with the abrasive grains.
Our products may seem rough because all the parts that touch the blade are abrasive grains.
However, our products are made using abrasives with the same grain size as indicated on the label, so you can use them with confidence.
See the scratches on the blade sharpened with a sharpening stone.

There is no specific amount of sharpening that you should do.
It depends on the condition of the blade, so it is best to sharpen it while checking whether it is sharp or not.
For those who are sharpening for the first time, it’s sometimes recommend painting the edge of the blade with an oil-based pen before sharpening. This is because when the painted area disappears, it is a good indication that the blade is being sharpened.

There is no specific amount of sharpening that you should do.
It depends on the condition of the blade, so it is best to sharpen it while checking whether it is sharp or not.
For those who are sharpening for the first time, it’s sometimes recommend painting the edge of the blade with an oil-based pen before sharpening. This is because when the painted area disappears, it is a good indication that the blade is being sharpened.

By dipping the sharpening stone in water, water is contained in the pores of the sharpening stone, which acts as a lubricant when sharpening.
It is recommended that you use the sharpening stone as if you are sharpening it in grit, with sufficient water in it.
Also, since it is made by the vitrified method, it can be used in water.

The co-grinding sharpening stone plays an auxiliary role in improving the performance of the main body of the sharpening stone. By simply rubbing the main grinding wheel with a small grinding wheel moistened with water a few times, you can get a good grip on the wheel and improve the grinding performance.
In addition, the abrasive residue left on the surface of the wheel after use is a mixture of fine iron and muddy abrasives, which will interfere with the next grinding if left unattended.
If left unattended, they will interfere with the next round of grinding. It is recommended to thoroughly scrub the surface with a co-grinding wheel after use and wash it with water, so that you can always enjoy comfortable grinding.

There is a slight difference in size due to the high temperature firing process. In order to emphasize the performance of the product, the weight of the molding is increased as much as possible. As a result, brownish color may appear on the side of the sharpening stone, but this is not a problem at all.
Although we do our best to inspect the product, cracks may occur due to the nature of pottery.
We use the same manufacturing method as for tableware, so it is unlikely that cracks will break immediately, but please let us know if there are any inconveniences.