Blue steel is white steel with alloys added. It holds an edge longer and is harder to bring back — which makes the better choice depend on how often you sharpen, not on which steel is finer.
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Japanese Knife Lab sets out the difference: Aogami — blue steel — adds chromium and tungsten to the carbon steel formula, giving better edge retention and slightly more toughness, with Aogami Super pushing edge life further still. The trade-off it names is that blue steel is slightly harder to sharpen and does not reach quite the same ultimate keenness as white.
So the alloyed steel is not the upgrade the price order suggests. The same source says professional sushi chefs who sharpen daily overwhelmingly prefer white steel for the purest cutting feel — because when sharpening is routine, edge retention buys you little and ease of sharpening buys you a lot. Reverse those conditions and the answer reverses with them.
Japanese kitchen knives on Amazon — the shelf ↗
Neither is stainless. SharpEdge, describing a Shirogami 2 blade, notes that the steel contains no chromium and will develop patina in use; blue steel adds some chromium but not nearly enough to make it stainless, so both still want drying after every use. The choice between them is about sharpening, not about maintenance — that part is the same either way.
A listing that names the steel — Shirogami 2, Aogami 2, Aogami Super — has told you something useful; one that says only “high carbon Japanese steel” has not. Where a hardness figure is given it is worth reading too: the Shirogami 2 blade cited below is stated at 61–62 HRC, and a listing willing to publish that number is generally willing to publish the rest. What no listing decides for you is how often you will sharpen, which is the question this page turns on.
Japanese kitchen knives on Amazon — the shelf ↗
The shelf, not a steel. Recommending one would mean assuming an answer to the question this page says only you can answer — how often you sharpen. What the link is good for is reading listings against the paragraph above: a knife that names its steel has told you something, one that says “high carbon Japanese steel” has not. The guides below cover what to sharpen on, and what the discolouration means once the blade is in use.
SourcesThe scent exists because the tree was infected. Uninfected wood is pale and light — whatever was added.
There is no dominant standard behind the number. Two #1000 stones can cut differently.
Glass dents, rolls and chips edges rapidly. Wood is self-healing — but grain matters more than "hardwood".
Two of these are the same knife. And a nakiri suits either hand; the usuba it resembles does not.
JIS defines it — and the definition says most washi today is machine-made from chemical pulp.
Carved from a single piece, so a snapped tine is not a repair. The tine count is a spec, not a score.
Not a quality ladder. Natural hair holds powder; synthetic is built for cream and liquid.
ISO and Japanese labelling define how matcha is made. Neither defines a grade.
Ground on one side only. The wrong side does not cut badly — it does not work.
One protects the blade, the other eats it. Scrubbing the wrong one leaves the knife worse off.
Western knives sit at 52–58 and 20–22°; harder steel is what permits 15–18°. Higher is a different bargain.
Repair is subtraction — grind past the chip on a coarse stone, then work back up the grits.
A gifted knife is said to sever the relationship. The custom is that the recipient hands back a coin.
Friction-fitted, not bonded — so it can be replaced. And a D-shaped handle is made for one hand.
The usual fix starts by soaking it. A seiro maker calls soaking strictly forbidden.
Dishwasher, microwave, sunlight. All normal, all irreversible on urushi.
Uncured urushi gives most people a rash. Cured, reactions are possible but less common.
A prefectural institute put eleven lacquer films through JIS Z 2801. Most came back undetectable.
The original ceased production around 1900. Since 1973 the word has meant pattern welding — decoration.
It conducts heat badly. That is the product — and it is also why it cracks.
Unglazed clay is porous until rice starch seals it — one simmer, once.
Induction heats metal, not clay. Most donabe never get warm — and cannot be converted.
Real urushi cures in a humid box over days to weeks. A kit that sets in an hour is something else.
Not urushi against epoxy. Whether the material states food-contact compliance.
Pointed where Chinese ones are blunt. And two ordinary gestures read as funeral rites.
Sumi is soot held by animal glue. India ink needs no binder and dries waterproof on its own.
The body is impermeable. It is the decoration that is exposed — and you can feel which kind it is.
One boils water and gives you iron. Putting the other on heat cracks its lining for good.
The spots appear in the first week. The makers’ association says do not take them off.
The form is settled by a 2003 paper. The amount is not settled by anything.
