It all depends on usage and the steel. In a high-use kitchen, sharpening on a stone every two to three months is a good guideline; for lighter domestic use, every four to six months is generally sufficient. Between sessions, a pass with a ceramic rod realigns the edge without removing material. Very hard steels, such as SG2 or Aogami Super, retain their edge for longer but require more work once dulled.
Sharpening a Japanese knife
Choosing your whetstone: understanding grits and their progression
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The grit of a stone indicates the fineness of its abrasive particles:
- coarse grit (200 to 400): repair a chipped or very dull blade, only if necessary;
- medium grit (800 to 1200): restore the edge, with 1000 grit being the usual starting point;
- fine grit (3000 to 6000): refine and polish the edge, up to 8000 on hard steels.
The sludge that forms during sharpening is abrasive: it is best to leave it in place.
Complete sharpening protocol using a whetstone: step by step
A sharpening session follows the same sequence:
- Prepare: soak the stone for 10 to 15 minutes, except for ceramic models, then place it on a non-slip support.
- Sharpen: maintain the angle and work in 3 to 4 cm sections, moving back and forth evenly along the entire length.
- Check: feel for the burr with your finger on the opposite side before repeating the process on the other side.
- Finish: rinse, dry immediately, then test the sharpness on a sheet of paper.
Sharpening according to the type of steel: carbon and stainless steel are not treated the same
Stainless steels, such as VG-10, Ginsan, or SG2, follow the usual progression: 1000 grit, then 3000 to 6000 grit. They tolerate residual moisture after the session better. Carbon steels, namely Aogami, Shirogami, and Aogami Super, are worked on the same stones, but the freshly sharpened metal oxidizes quickly and must be thoroughly dried. On an intact SG2, there is no need to go through a coarser grit: 1000 grit is enough to start.
When entrusting your knife to the Stay Sharp sharpening service
Certain situations go beyond routine maintenance. A broken tip, a marked chip, or a damaged bevel requires reprofiling. Single-bevel knives, such as the Yanagiba or Deba, also require a precise technique, because an angle error deforms the blade. The sharpening service of Stay Sharp is offered in-store, in Montreal and Quebec City, and by mail across Canada. The sharpening course allows you to learn yourself.
Frequently Asked Questions
How often should a Japanese knife be sharpened?
Can you use an electric sharpener for a Japanese knife?
It is not recommended. Most electric sharpeners enforce a fixed angle, often between 20 and 25 degrees, while a Japanese bevel is around 15 degrees. They remove a lot of material and can heat the blade to the point of locally altering its hardness. Pull sharpeners present a similar problem, as they strip away steel without control. Manual sharpening on a whetstone remains the method that respects the geometry of a Japanese knife.
Which whetstone should I choose to get started with a Japanese knife?
A double-sided 1000/3000 stone covers most needs: the 1000 side restores the edge, while the 3000 side refines it. Ceramic stones only need to be lightly wetted, making them easier to use. If you later want a finer edge, a 1000/6000 combination is another option. However, maintaining a consistent angle remains the most important factor, even more so than the choice of stone itself.
How to sharpen a single-bevel Japanese knife?
A single-bevel knife, such as the Yanagiba, Deba, or Usuba, is sharpened almost entirely on the beveled side. The flat side, called the ura, receives only a few light passes to remove the burr. The angle is narrower than on a double bevel, often between 8 and 12 degrees, which requires placing the blade almost flat. This flat side is slightly hollow: applying too much pressure would compromise the blade, hence the benefit of guided training.
Does the Stay Sharp sharpening service handle all types of knives?
It covers double-bevel Japanese knives, such as the Gyuto, Santoku, or Nakiri, and single-bevel knives, such as the Yanagiba or Deba. Some cases require prior assessment: chipped tips, full reprofiling, or single-bevel knives over 300 mm. The service is offered in-store in Montreal and Quebec City, as well as by mail across Canada. Western knives may also be accepted, subject to confirmation by the team.