How to store Japanese knives and keep them sharp

The first rule of care is the simplest. Shun advises washing a knife by hand with gentle dish soap, avoiding soaps with citrus extracts or bleach because they can promote rust, then rinsing and towel drying at once.¹ Do not leave the knife sitting in a sink of soapy water, because prolonged soaking is hard on metal and a hazard when you reach in. A knife that stays wet is a knife that starts to rust.

Yoshikin, which makes Global knives, asks owners to wash with neutral detergent and dry thoroughly before storing, and to wash at once after cutting salty or acidic food such as citrus and pickles.⁸ It also asks owners to avoid bleach, whose chlorine may cause rust, so keep to soft soap and plenty of rinsing.⁹ The habits agree across both makers: soft soap, quick rinse, thorough drying.

Shun is clear that stainless knives are not rust-proof. It says stainless steel can still develop rust and that moisture left on the blade is the cause.¹⁰ The practical rule follows. Dry the blade and the handle with a soft absorbent cloth, let it air a moment, and then put it away.¹¹ Shun adds that hand washing is also the best way to care for wood handles, so the same routine looks after the whole knife.¹²

Your cutting surface decides how fast the edge dulls. Shun prefers medium-soft woods such as hinoki and says tile, ceramic, synthetic, marble, granite and glass boards are not recommended and can be hard on knives.⁶ Yoshikin asks for a soft board of wood or plastic and says not to drop the knife in a sink or on the floor, because impacts can chip an edge or break it, and a soft board is the gentlest place to land the blade each time you cut.²¹

Food matters as much as the board. Yoshikin lists pumpkin, corn, dried rice cakes and bones as foods its knives should not be used to cut.²² Shun asks owners not to use its knives on bones, joints or frozen foods.²³ It says its cutlery is designed for a smooth slicing motion and never an up-and-down chop.²⁴ A Japanese blade is designed for precision slicing rather than for crushing through hard material, and you will feel the difference after a few meals.

If you do chip an edge, the news is better than it sounds. Shun says micro chips can follow from unfamiliar technique on very hard stainless steel or from rust at the thin edge, and that micro chips can be sharpened out.²⁵ Treat a chip as a prompt to look at your board and your habits, then see a sharpener, rather than as a reason to retire the knife, and inspect the blade each time you use it so you catch the next one early.¹³

When you read reviews of Japanese knife companies, look past the star rating to what happens after the sale. A knife is a long purchase, so a maker's repair and sharpening service tells you more than a launch-week review. Shun offers to sharpen its cutlery for free for as long as you own it.²⁶ That is a concrete promise a reader can check, and it says more about a company than the praise or the complaints in a pile of reviews.

Aritsugu in Nishiki Market says it aims for long-lasting use of its knives through repairs such as sharpening.²⁷ Yoshikin runs a re-sharpening service limited to Japan, so overseas customers must ask their retailer.³² These facts matter for a tourist: a service in Japan does not help you at home unless the maker or shop ships back, so ask about overseas service before you pay for a knife in Kyoto, and keep the receipt.

A last check is how the company talks about chips and rust. A maker that explains the causes, as Shun does, and offers to repair small chips of 2 mm or under, as it does, is treating the owner as a partner.^25,31 A review that blames the steel without mentioning the board, the food or the drying may be missing the cause. Read for the pattern, not for a single angry post, and weigh a company by what it offers owners after the sale.