How to Care for a Carbon Steel Japanese Knife — A Beginner's Guide

Hi — let's talk about the two knives almost everyone considers first. If you've spent any time looking at Japanese knives, you've already met them: the Gyuto (Japan's take on the Western chef knife) and the Santoku (the friendly multi-tasker). They show up in every brand's catalog. They cover most of the same tasks. They cost similar money. So: which one first? The honest answer is "it depends on how you cook." This post is going to make that depends-on actually useful instead of cop-out vague. In one paragraph A Gyuto is a long (210–240mm), curved Japanese chef knife designed to do everything a Western chef knife does, with thinner steel and a finer edge. A Santoku is shorter (165–180mm), flatter, and squarer — it's faster on a small cutting board and more confident on vegetables, but loses range on big proteins. Pick a Gyuto if you cook in real volumes or break down meat at home. Pick a Santoku if your kitchen is small, your hands prefer something lighter, or vegetables are most of what passes under your knife. Side by side Feature Gyuto Santoku Length 210mm or 240mm 165–180mm Edge profile Curved (slight belly) Mostly flat Tip Pointed, ready to break down a fish or chicken Sheepsfoot — drops down, no real point Cutting motion Rocks happily; pushes well Pushes; doesn't rock Best at Long meat strokes, big vegetables, mise for many Quick veg, small proteins, dense kitchens Weak at Cramped boards Big roasts, breaking down a chicken, long fish fillets First Japanese knife? If you cook a lot If you cook compactly Length is destiny The single biggest thing that separates them in real life is length. A 210mm Gyuto is long — it eats cutting board real estate, it slices through a watermelon in one stroke, and on a small kitchen counter it can feel like swinging a sword. A 165mm Santoku just fits. If your cutting board is smaller than 35cm, a 240mm Gyuto will frustrate you. A 210mm Gyuto is borderline. A Santoku is at home. If you regularly cook for six or do real prep — breaking down a whole chicken, slicing a brisket, making a stir-fry from a mountain of vegetables — the Gyuto's reach is a different category of pleasure. Edge profile matters more than people say A Gyuto has a curved belly — the cutting edge dips down, then sweeps back up to the tip. This is what lets it rock. (Rocking = tip stays planted, heel goes up and down. Western chef knife motion.) A Santoku is almost flat — the edge is mostly straight along the bottom, then takes a sharp drop into the sheepsfoot tip. You can't rock it. You push. (Push cutting = lift the heel, drive forward, slice through, lift again.) This isn't a small thing. If you grew up rocking a Wüsthof and you buy a Santoku, you'll fight it for a month. The knife is not broken — it's asking you to learn a different motion. (And once you do, you'll cut faster.) If you don't want to relearn how you cut: get the Gyuto. The "small hands" myth, mostly People sometimes say "Santoku is for smaller hands." That's half-true and half-not. What's true: a 165mm Santoku is lighter and shorter than a 240mm Gyuto, so it's less tiring in a small hand over a long session. What's not true: a 210mm Gyuto isn't unwieldy for a smaller person. The handle is the same size as a Santoku's. It's the blade length that's different, not the grip. If you have small hands but love long blades: get a 210mm Gyuto. Don't talk yourself into a Santoku you don't want. Who each one is for, plainly Get a Gyuto if you: Cook proteins regularly (whole chickens, big steaks, fish fillets) Have a generous cutting board (40cm+) Like rocking through onions and herbs Want one knife that does almost everything Get a Santoku if you: Cook mostly vegetables and quick weeknight food Have a small kitchen and small board Already have a Western chef knife and want a second-knife contrast Want to learn push-cutting (Japanese style) from scratch Skip both and get a Bunka if you: Want the Santoku's flat edge and the Gyuto's tip in one knife. (We wrote about Bunkas here.) What about steel? Both shapes come in everything: stainless VG-10, carbon Aogami, powdered SG2, you name it. Don't let steel choice override shape choice. Pick the shape that fits how you cook, then pick a steel that fits how you maintain. (Aogami vs Shirogami here.) A practical pick If you're new and budget-curious: Tojiro DP Gyuto 210mm or DP Santoku 170mm. VG-10, stainless, honest geometry, won't punish a learner. If you want to step up: Hatsukokoro Hayabusa Gyuto 210mm or Sakai Takayuki Ginsan Santoku 180mm. Real Japanese geometry, real Japanese steel, real difference in feel. Browse all Gyutos → Browse all Santokus → — The Upscale Living team

Hi — let's talk about Hatsukokoro. If you're scrolling through the catalog you'll see the name everywhere: Hayabusa, Kumokage, Saihyo, Ryuhyo. They look different, the steel changes, the prices shift. And yet the badge on every box says the same thing. That's because Hatsukokoro doesn't make any knives. Stay with me — that's the whole point. In one paragraph Hatsukokoro is a Japanese knife brand-house: a curator that partners with master smiths across Japan and brings their work out under one name. Each line — Hayabusa, Kumokage, Saihyo, Ryuhyo, and others — comes from a specific forge with a specific steel and a specific finish. The lineup is intentionally broad. Pick a Hatsukokoro and you're getting a smith's work; pick a line and you're choosing what kind of knife you want to live with. Why "brand-house"? In other Japanese knife brands you'll meet, one workshop forges everything — the same family hammers and finishes every blade that goes out the door. With Hatsukokoro the model is different. The name is the project; the smiths are the project leads. This is closer to how clothing labels work than how most knife shops do. A house signs work from many hands, applies a shared editorial eye, and sells under one banner. The upside for you, the buyer: a single brand can cover almost every price point and use case without the catalog feeling random. The lines, plainly This isn't an exhaustive list — Hatsukokoro adds and rotates lines — but these are the ones you're most likely to see at Upscale Living right now. Hayabusa. Aogami Super (carbon, very hard, holds an edge for ages) under a clean kurouchi or migaki finish. The workhorse pick. If you want a Hatsukokoro that you'll use, Hayabusa is usually the answer. (For more on what Aogami is, see our Aogami vs Shirogami guide.) Kumokage. Aogami #2 with a kurouchi blackened finish and damascus cladding. Steel is slightly softer than Hayabusa's Super (which makes it more forgiving on the stones), and the look is more dramatic — the cloud-shadow patterning is where the name comes from. Saihyo. SG2 powdered steel with damascus polish. Stainless, holds a very long edge, gets polished bright at the factory. This is the line for cooks who don't want to think about wiping the blade dry every five minutes. Ryuhyo. SG2 with a more refined migaki finish, often in flagship geometries (longer gyutos, sleeker grinds). The dressier sibling of Saihyo. The pattern: Hayabusa for the daily driver, Kumokage if you want the look and don't mind a little patina, Saihyo for stainless ease, Ryuhyo for showpieces. Who's actually making them? This is the part Hatsukokoro doesn't shout about: each line corresponds to a real, named smith. We won't list specific name-to-line pairings here because the partnerships shift over time and we'd rather you ask us than rely on a stale internet guess. But if you want to know who forged a particular knife you're looking at, message us — we'll tell you what we know. The point isn't trivia. It's that when you pick up a Hayabusa, that geometry isn't a marketing decision — it's how that smith forges. When you switch to a Kumokage, you're holding a different person's hand on the hammer. How to pick your first one If you've never owned a Japanese knife: go Hayabusa Bunka 180mm or Hayabusa Gyuto 210mm. Aogami Super is wonderful to use, the kurouchi finish forgives water spots and patina, and the price is honest for what you're getting. (Not sure between Bunka and Gyuto? Read our Bunka guide.) If you have one Japanese knife already and want something more ambitious: Saihyo Gyuto 210mm. Stainless ease, premium steel, damascus look — a clean step up. If you're chasing the visual and you're fine maintaining carbon: Kumokage Bunka or Gyuto. Best looks per rupiah in the lineup. If you're shopping for a flagship or a gift: Ryuhyo 240mm Gyuto. Stretched geometry, premium fit, the kind of knife you keep for ten years. Care notes Hayabusa / Kumokage are carbon — wipe dry, expect a patina, oil occasionally. Saihyo / Ryuhyo are stainless — easier in the kitchen but still don't go in the dishwasher. All Hatsukokoro knives respond well to a 1000-grit whetstone every few months. Don't use a pull-through sharpener — those things will eat the geometry the smith gave you. A last word Hatsukokoro is a clever idea executed cleanly. You get a unified brand experience — consistent presentation, easy to navigate, predictable quality control — without losing the thing that makes Japanese knives interesting in the first place: that someone made this, in a specific place, with their hands. See all Hatsukokoro at Upscale Living → — The Upscale Living team

If you've started shopping for a Japanese knife, you've probably run into two names that sound made up: Aogami and Shirogami. They're not made up — they're two of the most respected steels in Japanese knifemaking, and the difference between them is real. Let's go through what they actually are, in plain English, and which one you should pick. Why are they called "blue" and "white"? Hitachi Metals — Japan's industrial steel company — sells its high-carbon tool steels wrapped in colored paper. The paper is just for warehouse identification. **Blue paper is Aogami (青紙). White paper is Shirogami (白紙).** That's it. The names tell you nothing about the steel; they just tell you what's in the wrapper. Both are excellent steels. Both are carbon steels (we'll explain why that matters in a second). The differences are in what each one is made of, and how that translates to how the knife behaves in your hand. The fast answer (if you just want a recommendation) Most people reading this just want to know what to buy. Here's the short version: Shirogami #2 → Your first carbon knife. Pure-feeling, easy to sharpen, takes an outstandingly fine edge. Slightly more demanding to maintain. Aogami #2 → Better balance for daily life. A bit harder, holds an edge longer, slightly more forgiving. Marginally harder to sharpen than Shirogami. Aogami Super → The enthusiast's pick. The hardest of the three, best edge retention, gives a distinctive "alive" feeling when you cut. Premium price; harder to sharpen but rewards the effort. Shirogami #1 → The purist's choice. More carbon than #2, takes the finest edge of any common Japanese steel. Demanding to maintain. If that's enough to decide, browse our Aogami collection or our Shirogami collection. If you want to actually understand why these differ, keep reading. What's in each steel? Both Aogami and Shirogami are high-carbon steels — meaning they have enough carbon (around 1.0–1.4%) to take a hard, fine edge when properly heat-treated. Neither has chromium worth mentioning, so both can rust if neglected. (Most modern Japanese knives wrap them in a stainless layer that protects everything except the cutting edge — more on that below.) The difference is what else is in the alloy. Shirogami (white paper) is essentially carbon and iron. Almost nothing else. Hitachi keeps the impurities very low and the grain structure very fine. The result: a steel that's easy to sharpen and capable of an extremely refined edge — the kind that surprises people the first time they slice a tomato. Aogami (blue paper) is white paper steel plus tungsten and chromium. Tungsten forms hard carbides that resist wear (= longer edge retention). Chromium adds a tiny bit of corrosion resistance and stability. The result: a steel that holds its edge longer, takes a little more work to sharpen, and is more forgiving when you forget to wipe it dry. The numbers — #1, #2, Super — refer to carbon content and grain refinement. #2 is the everyday standard. #1 has more carbon (slightly harder, slightly trickier to sharpen). Super sits above #1 with extra additions for extreme hardness — it's the enthusiast tier. How they perform, in real-world terms Property Shirogami Aogami Edge retention (how long it stays sharp) Good Better Ease of sharpening Easier A bit harder Peak sharpness it can reach Higher (especially #1) Very high (especially Super) Reactivity (rust risk) Higher Slightly lower Patina development Fast, dramatic Slower, more subtle Price (for similar maker) A bit cheaper A bit more These are subtle differences. A great Shirogami knife in skilled hands cuts as well as a great Aogami knife. Picking between them is more about what kind of relationship you want with the knife than about objective quality. What's a "patina" and why does everyone talk about it? When you use a carbon steel knife, the blade develops a gray-blue-purple film over time. This is patina, and it's good. It's a controlled oxide layer that forms a thin shield between the bare steel and air, slowing actual rust. Cooks who use carbon knives daily will tell you the patina is half the appeal — every blade ends up unique to its owner. Two ways to get there: Use it. Cut a few onions, slice a tomato, leave the knife 30 seconds before wiping. The patina starts within a week of regular use. Force it. Coat the blade in plain mustard or rub a sliced lemon along it. Let sit 10 minutes. Rinse and dry. Instant uneven patina. What you don't want is red rust — orange-brown spots that pit the steel. That's a maintenance failure, not patina. A wipe with mineral oil after washing prevents it, and we wrote a whole care guide on this. A practical detail people miss: stainless cladding This is important because it changes the maintenance picture: most modern Japanese carbon knives have a stainless or iron cladding layer wrapped around the carbon core. Only the actual cutting edge is exposed carbon — a strip 2–3mm wide along the bottom of the blade. Everything else is rust-resistant. This makes carbon knives much less fussy than old internet wisdom suggests. You don't have to obsessively dry the whole blade; you just need to dry the bottom edge. Modern knife-making has made carbon steels far more livable. Which to actually buy first Here's how we'd think about it: First carbon knife, you live in a humid kitchen (most of Indonesia, frankly): Aogami #2 with stainless cladding. Most forgiving on the days you forget. The Hatsukokoro Hayabusa, Kumokage, and Nigara lines are great here. First carbon knife, you're naturally meticulous and patient: Shirogami #2. The sharpening experience alone teaches you about steel. Tadafusa is a classic introduction. You already own a high-end stainless (VG10, SG2) and want to feel something different: Aogami Super. The edge feels distinctly different — more "bite" into food, more responsiveness on the stones. You want a small starter to test the waters before committing to a chef knife: a Petty in either steel. Lower risk, same lesson. In-stock examples we'd point to To make this concrete, here are knives currently on our shelves: Tadafusa Kurouchi Shirogami #2 Santoku 165mm — the classic introduction to Shirogami #2 from a Sanjo maker who's been doing it for generations. Kurouchi finish hides early patina. See it → Hatsukokoro Hayabusa Aogami Super Bunka 180mm — workhorse Aogami Super under a stainless cladding. The "if I had to keep one" pick for many of our customers. See it → Hatsukokoro Kumokage Aogami #2 Kurouchi Damascus Bunka 180mm — Aogami #2 with a kurouchi finish hiding the inevitable patina, layered into a Damascus pattern. See it → Mutsumi Hinoura Shirogami #2 SS Kuro-Nashiji Petty 150mm — small Shirogami petty for testing the steel without committing to a chef knife. Hinoura is a respected Sanjo blacksmith. See it → Or browse all our Aogami knives and all our Shirogami knives. One last thing The single biggest factor in how a knife performs isn't which steel — it's the maker's craft. A great Shirogami #2 from a master smith will out-cut a mediocre Aogami Super from a factory line. Pick the maker first; pick the steel second. If you'd like help thinking it through, drop us an email or come visit Jakarta or Bali. Steel is much easier to understand when you can hold it.