Sharpening
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How knife sharpness is measured: Japan’s paper-stack test
A 2014 Gifu Prefecture report explains Japan’s Honda-type paper-stack sharpness test, CATRA, ISO 8442-5, and why results differ by setup.
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Japanese knife sharpener: what a 2026 Japan survey found
What did a 2026 crowdsourced survey of about 300 respondents in Japan say about dull knives? Four sharpener types sold there, plus Ken’s MARNA sharpener.
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Can you use a knife sharpener on Japanese knives?
Yes, on a double-bevel knife with the right sharpener — what Japanese makers say about sharpeners, honing rods, and whetstones, and which fits your knife.
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Whetstone grit for beginners: which stone to buy first
Whetstone grit for beginners: Japanese makers agree on a #1000 medium stone but recommend different finer grits — based on their own guides.