#culinary craftsmanship

Claims that knives are “self-sharpening” and never need maintenance are just a marketing gimmick. While it’s true that sharpening intervals vary—ranging from a week for budget Chinese knives to a year or more for premium Japanese brands—every knife needs attention eventually. Each sharpening session removes a small amount of steel, so over-sharpening or incorrect sharpening techniques can quickly wear down the blade’s edge. However, there’s no need to be afraid of sharpening your knives yourself—if done correctly, the blade will regain its sharpness and stay sharp for longer.

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Choosing the Right Sharpening Stone

Sharpening stones come in different types, including ceramic, diamond, and water stones. There are also honing rods (mousat), which are used for regular blade maintenance. Water stones are the best option for high-end Japanese knives with steel blades, as they remove minimal material while sharpening. Honing rods can also be useful for polishing a blade that’s not yet dull, prolonging the period between full sharpenings.

Water stones are categorized by their grit size, indicated by a number (# or grit). The coarser the stone, the more material it removes:

Coarse (up to #1000): Used to reshape the blade or restore a worn edge.

Medium (#1000-3000): Ideal for sharpening and making the blade sharp again.

Fine (above #3000): Used for finishing and polishing the blade’s edge.

To properly sharpen your knives, you should ideally have a stone for each stage of sharpening. A stone’s length should be 1.5 to 2 times the length of your knife’s blade for best results. Thicker stones last longer, but even thin ones can be glued to a wooden base for easier handling.

The Importance of the Right Sharpening Angle

The sharper the angle, the sharper the knife—but don’t change the angle that was set by the manufacturer, as this could affect the knife’s geometry and performance. Japanese knives are sharpened at a shallower angle (15-20 degrees) than European ones (30-45 degrees). If you’re unsure about the right angle for your knife, here are a few tips:

Use scissors: Place the blade edge inside the scissor blades, fix the position, and measure the angle with a protractor.

Use paraffin: Embed the knife in a block of paraffin, then measure the resulting angle once the paraffin sets.

How to Sharpen Knives with a Stone

Sharpening knives by hand with a water stone requires attention to detail. Here’s what to keep in mind:

Prepare the stone: Soak the sharpening stone in water before use, allowing the blade to glide smoothly. Soak coarse stones for 3-5 minutes, medium stones for 10-15 minutes, and fine stones for 20-30 minutes, until air bubbles stop rising from the stone’s surface.

Set the angle: Use a sharpening angle guide or fold a piece of paper into the desired angle and hold it beneath the blade.

Sharpening Process: For single-beveled knives, sharpen along the edge until a burr forms, then remove the burr by lightly sharpening the opposite side. For double-beveled knives, sharpen each side evenly in stages.

Final Sharpening: Use a fine-grit stone to perfect the blade. Avoid putting pressure on the blade, which could damage the stone or blade.

Check the Result: Never test the blade sharpness with your fingers. Instead, slice through a tomato or cut paper mid-air. A sharp knife should make clean cuts.

Sharpening Ceramic Knives

Ceramic knives are made from zirconium oxide, making them extremely hard and durable. However, they require diamond-coated stones or sharpeners to restore their sharpness. Remember, ceramic knives are more fragile than steel ones, so handle them with care during sharpening.

Alternative Sharpening Methods

For home use, many people prefer using simple knife sharpeners, which are convenient and easy to use. They come in different varieties—manual, electric, or even roller-based—and can often sharpen other kitchen tools like scissors. But remember, automatic sharpeners remove more material from the blade than hand sharpening, which can shorten the lifespan of the knife.

Common Mistakes

Now that we’ve covered how to properly sharpen knives, here are some common mistakes to avoid:

Sharpening on a dirty or greasy knife

Using too much pressure during sharpening

Disrupting the factory-set sharpening angle

Using only one type of stone