The 10 Commandments of Japanese Steel
A Japanese knife is not just a tool; it is a relationship. Treat it with respect, and it will serve you for a lifetime. Neglect it, and it will fail you when you need it most.
The Absolutes
01. Thou Shalt Not Dishwash
The dishwasher is the death of fine cutlery. The high heat destroys the handle's epoxy, the harsh detergents eat away at the edge, and the water jets bang the blade against other utensils. Hand wash only, immediately after use.
02. Keep It Dry
Carbon steel (Shirogami/Aogami) will rust in minutes if left wet. Even stainless steel is only "stain-less," not "stain-proof." Wipe your blade dry immediately after washing. For long-term storage, apply a thin layer of Camellia oil (Tsubaki).
03. Respect the Hardness
Japanese steel is hard (60–65 HRC), which makes it sharp but brittle. Do not twist the blade, pry open cans, or cut through frozen foods, bones, or hard seeds (avocado pits). Use a cleaver for heavy work; use your Japanese knife for precision.
The Surface
04. Choose Your Board Wisely
Glass, granite, and ceramic cutting boards are enemies of the edge. They will dull your knife instantly. Use end-grain wood (walnut, maple) or soft rubber (Hasegawa, Asahi) boards that "give" under the blade, preserving sharpness.
05. No Steel Hones
Never use a ribbed steel honing rod on a Japanese knife. The hard steel will chip against the ridges. If you must hone, use a smooth ceramic rod or a leather strop loaded with compound.
06. Store It Properly
Tossing your knife into a drawer is a guaranteed way to damage the edge — and your fingers. Use a magnetic knife strip, a wooden knife block, or individual blade guards (saya). Never let the edge contact other metal.
The Maintenance
07. Sharpen on Whetstones
Japanese knives deserve Japanese sharpening methods. Water stones (whetstones) are the gold standard. A 1000-grit stone for regular maintenance, a 3000–6000 grit for polishing. Avoid pull-through sharpeners — they remove too much metal and leave a rough, uneven edge.
08. Know Your Bevel
Most Japanese knives are single-bevel (sharpened on one side only) or asymmetric double-bevel. Sharpening the wrong side — or at the wrong angle — will ruin the geometry. If you are unsure, bring it to a professional.
09. Treat Rust Immediately
Surface rust (red/orange spots) can be removed with a rust eraser or a paste of baking soda and water. Deep pitting rust requires professional restoration. Act fast — rust spreads.
10. Let the Professionals Handle Major Restoration
Chips, broken tips, and severe edge damage require reprofiling on coarse stones. This is not a beginner task. Attempting to fix a chipped edge without proper technique can permanently damage the blade geometry. Know when to call a togishi.
Already Damaged Your Blade?
Don't worry. Chips, rust, and broken tips are part of the journey. We can restore your knife to better-than-new condition. Book a restoration and let us take care of it.