Many people ask me about when they need to sharpen their knives. In which situation the knife is considered dull? The answer is in the beginning of the video. You can simply test your knife on a tomato. I'd like to test Naniwa Professional 400 Grid Whetstone and Imanishi Marble 400 Grid Whetstone with this knife. I start with Naniwa.

Budget: 🌑 🌑 🌑 🌕 🌕
Naniwa Chosera (25mm in thickness), Naniwa Professional (20mm in thickness) and Naniwa NA (15mm in thickness). This line-up is never cheap. But good quality. Depending how often you use it, you can choose different series with different thickness. All three series have exactly the same formula and quality. For 400 grid, I suggest you get at least 20mm in thickness. Normally 400 grid should be used quite often.

Abrasive: 🌑 🌑 🌑 🌕 🌕
The stone cuts ok. Not super fast. But it gives you great primary edge surface. With mud slurry, it cuts better.

Fineness: 🌑 🌑 🌑 🌕 🌕
You get very even scratching marks on the edge. But still micro zigzag after 400 grid.

Load up (self-clean): 🌑 🌑 🌑 🌓 🌕
No problem on this point. Very good performance. You can see the load up, but most of it can be removed by hand easily.

Polishing: 🌑 🌑 🌕 🌕 🌕
It's too early to talk about polishing on a 400 grid stone.

Durability: 🌑 🌑 🌑 🌕 🌕
It is not a hard stone. Medium hardness. It's good to have it.

Tactile Feedback: 🌑 🌑 🌑 🌕 🌕
Without mud slurry, the tactile feedback is not bad. I can't say it's smooth, because you mainly feel grinding when sharpening. With mud slurry, it feels better.

Sharpness: 🌑 🌑 🌓 🌕 🌕
After this 400 grid stone, it is just ok to use. But I bet you expect better edge.

Convenience: 🌑 🌑 🌑 🌑 🌓
Splash and go, very convenient.

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