• Sharpening your knives may seem complicated, but with the right guidance, anyone can master it. At KIREAJI, we’ve gathered clear, practical answers to common sharpening questions—so you can enjoy both the process and the results with confidence.

FAQ About Whetstone

Whetstones and sharpeners serve different purposes. A whetstone lets you properly shape, thin, and refine the entire edge of your knife—giving you lasting sharpness. A sharpener, on the other hand, is mainly for quick touch-ups to restore cutting performance temporarily. For true, long-term sharpness, a whetstone is essential.

It depends on your goal. If you simply want to "cut food," sharpen as needed. But if you care about enhancing flavor and texture, more frequent sharpening is key. A perfectly sharpened knife preserves ingredients’ structure, maximizing taste. For home cooks, sharpening every 1-3 months is typical. Daily sharpening is ideal for professional or passionate cooks.

That "slurry" is a mix of metal from your knife and grit from the whetstone. It may look messy, but it actually plays a key role in refining the blade.

Both approaches are valid. Sharpening with the slurry speeds up the process. Rinsing it off with water allows for more precise, controlled sharpening. It depends on your priority: speed or precision.

A good rule of thumb: sharpen with just enough pressure that your hands wouldn’t feel sore after an hour. Let the stone do most of the work—pressing too hard can damage your edge

Yes. A resurfacing stone (also called a flattening stone) restores the whetstone's flat surface. Flatten it regularly for consistent sharpening results.

Small cracks can be resurfaced and used carefully. But once cracks grow larger—especially as the stone becomes thinner—it’s best to replace the whetstone to avoid further breakage.

If it felt rough at first and then suddenly became slippery, your whetstone may be clogged. Resurfacing it restores its proper texture. If it's slippery from the start, the stone might be poorly matched to your knife—especially with stainless steel blades—but using the sharpening slurry can improve grip.

It’s recommended. A quick soak enhances performance. However, diamond resurfacing stones don’t require soaking.

Sharpening takes time—don't get discouraged. True skill comes from combining knowledge with practice. We suggest reading a reliable sharpening guide, practicing on your knives, and re-reading the guide as your experience grows. What seems complicated at first often "clicks" after hands-on learning.

With patience, anyone can master sharpening—and unlock their knife’s full potential.

Daily Care of Whetstone

While whetstones are crucial for knife maintenance, you might wonder if they require any special care themselves. Although they generally do not need much attention, the most serious issues they can encounter—akin to rust on knives—are warping and denting. It's important to know what to watch for to prevent these problems and ensure your whetstone remains in good condition for clean and effective use.

Daily Care of Whetstone
  • The foundation of cooking is cutting, and the tool that supports this foundation is a well-sharpened knife.

    Carefully cutting ingredients is the first step in cooking, and it greatly affects the taste, texture, and appearance of the dish. The knife, finely honed, is what supports this crucial moment. A sharp knife cuts smoothly without crushing the ingredients, bringing out their natural flavors and qualities.

  • The act of sharpening a knife is not just about making the blade sharper; it is a form of dialogue with the tool, a preparation of the mind for the art of cooking. As traditional artisans, we pour our hearts into crafting knives that not only fit the hands of their users but also elevate the joy of cooking. If our work can bring small moments of happiness to those who love cooking, there is no greater satisfaction for us.

  • japanese_knife_made_in_Sakai

    1. Exceptional Japanese Knives

    Our knives, crafted by Sakai City's master artisans, combine traditional techniques with carefully selected materials, delivering unrivaled sharpness and durability.

  • 2. For a Lifetime of Use

    At KIREAJI, we see knives as lifelong companions. Each knife comes with a free saya, and we offer Honbazuke hand-sharpening by Shiroyama Knife Workshop in Sakai City.

  • 3. Supporting the Joy of Continued Use

    KIREAJI knives are made to grow with you. That’s why we provide trusted after-sales care (fee-based) .