Ask Benjamin
From Bench Stone to Finish
How these tools are use, in order and why.
1. The Goal
Before the tools, the target.
On a clad blade, the kasumi you are aiming for is a vivid, close-to-natural-mirror core, a more matte cladding full of quiet detail, and a sharp line separating the two.
On a honyaki, the picture is different: a bright hagane — the hard steel — against a dark, vibrant jigane, with a clear hamon between them.
Same stones, two orders. The metal decides the sequence. Everything below serves one of these two pictures.
2. Bench Stones First — and Why Not Sandpaper
Everything begins with a bench-stone progression. The coarser natural stones remove the last scratches left by synthetic stones; each following stone refines the surface further. Two things are decided here and nowhere else: the finish on the core, and the sharpness of the line between core and cladding. Both are limited by your last bench stone — no finger stone will rescue them later.
A tip on soft stones: all uchigumori, and some other soft stones, benefit from 10–20 minutes in fresh water before use. Without it they dry quickly and the slurry breaks down mid-work. Hard stones never benefit from soaking.
Why not sandpaper? The scratch pattern from sandpaper is an arc — the radius of your forearm — and it stays in the surface as an arc no matter how fine you go. A bench stone leaves straight, parallel geometry. Sandpaper also spreads pressure less evenly than a solid, flat stone; it can dig hills and valleys that carry their own shadows. Two people can arrive at the same grit, and one of them has a surface that will never take a clean kasumi — and he has no idea why. He'll blame the finger stones. He'll blame the compound. He'll buy more things, and none of them will fix it. The geometry was lost three steps earlier.
There is one honest job for sandpaper — the spine and the heel. See chapter 7.
3. Reading the Surface — Core and Cladding
The core of a clad blade is a thin band. You set it where you want it — hazy, semi-mirror, or a scratch-free natural mirror — with your bench stones, and the line against the cladding stays sharp. From here on, it mostly stays as your bench stone left it: the finger-stone work that follows is cladding work.
The cladding is large by comparison, and every small difference in contrast will be visible across it. So the first ambition is evenness. Perfect is always good enough — and a perfectly even haze is worth more than a heap of micro-detail that looks uneven from across the room.
4. The Cladding Path
Begin with Haze, the softest, and let it lay a uniform, matte kasumi over the cladding. Refine with Clarity; the surface should already look clean.
Going finer can reveal scratches that were hiding in the haze. Pause here, and clean the surface with Zero until the blade looks completely scratch-free. Zero is fast and very fine; the surface becomes detailed and moves close to a semi-mirror. Most people skip this step. The result always shows it.
A final pass with a thin Depth stone lays an even, fine haze back over the cladding, lifts the texture of the iron, and leaves the whole surface clean.
Want more out of wrought iron? Detail will do it. Detail stones are harder and want care on soft iron: worked very thin, until they flex, and used with light pressure. If the result turns too harsh or too vivid for your taste, a light pass of Zero and Depth brings the finish back to your liking — the detail you gained stays visible underneath.
Where KREAM fits: KREAM Haze can refresh or even out a cladding in minutes, and KREAM Detail comes after fine finger stones, when you want the surface to give more. Both are in chapter 6.
5. The Honyaki Path
The target here: a bright hagane, a dark and vibrant jigane, a clear hamon.
First, a caution. A honyaki carries a large surface of very hard steel, so the work takes time — and even with endless time, the steel sets a hard limit on what it will allow.
Preparation matters differently here. A hard, fine bench stone on the hagane leaves it uneven and scratchy, and it will not contrast against the jigane. What you want is a softer stone with the right grain — one that breaks the light in every direction. On the jigane you can go finer, to bring out the activity, but carefully: a stone that is too hard burnishes the soft steel and makes it look harsh, so the blemishes show more than the life in the metal.
Then the progression. Haze first, for most of the time, over the whole blade; Clarity after, for an even surface. Then very thin Detail stones, to refine and draw more and more texture out of the jigane — the jigane takes harder and finer stones than wrought-iron cladding ever would, which is why Detail appears this early here.
Now the finish. Clean the jigane with Zero. The surface is unforgivingly large, and this step is essential — it opens the door to the finest activity. The moment your eyes can't find a scratch anywhere (bravo!), a thin Depth stone harmonizes the surface. A tip at this stage: KREAM Detail can join the work along the Zero passes, worked over the whole blade between them — see chapter 6 for how it's used.
The last step is Softest Haze, and it is what the whole order was building toward: the hard hagane reaches its brightest point, the hamon stands out, and everything sits against a darker, almost-glossy jigane. You can still adjust afterwards — Softest Haze on the hagane, Depth on the jigane — until the balance is yours.
One more honyaki tip: the hagane sometimes shows along the spine. It's a small, awkward spot for finger stones — KREAM Haze handles it easily.
6. KREAM — Haze and Detail
KREAM Haze develops a clean, uniform kasumi in minutes. It removes light rust, patina and small inconsistencies, which makes it a maintenance step between sessions, or a foundation before finer work — it is forgiving of a preparation that was a little rushed. My goal when developing it was to come close to what finger stones do: not identical, but a similar haze, laid down with nothing more than a fingertip. Apply in small amounts and work until the surface turns matte. For a more matte result, a worn finger stone can serve as the applicator, at the cost of some control. Anything abrasive as an applicator will put scratches in — don't.
KREAM Detail rewards patience. It is slower than Haze, and it wants a single drop of oil worked in with time and pressure. That one drop is the key, and it is enough. Skip the oil or rush it, and you get a milky look; give it the time, and the surface moves toward mirror while the details come up step by step — until it's spitting detail back at you like aluminium foil. For more shine, finish with a cotton pad and one more small drop of oil; any food-grade oil works. The formula is fat-based and doesn't evaporate, so the blade stays protected through a long session. When you're done, wash with warm-to-hot water, a sponge and dish soap — after that, the surface is smooth enough that oxidation isn't a worry.
One note on that smoothness: because KREAM Detail leaves the surface very smooth, contrast can soften a little. An almost worn-out fine finger stone brings it back beautifully — and even if you go a bit far with that step, the detail KREAM added stays visible. So you can work freely. This alternation — KREAM, then a nearly spent fine stone, and back — is the most rewarding routine in the range for those willing to work with it.
7. Technique Notes and Edge Cases
Where to test. Depending on the geometry, the tip, the area around the first third, and the part just before the heel are where a polish tends to look its best. For trying a stone or a step, use the tip — it's the easiest area to polish again and again.
Direction. Above #1000 grit, everything is done strictly parallel to the length of the blade; a kasumi always reads cleaner that way. One exception: the kissaki of a sakimaru — as on swords — is polished strictly perpendicular
Thickness. Finger stones want to be almost paper-thin for surface work: a thick stone can scratch where a thin one forgives. Mine come at about 1 mm — perfect for geometry, when you want a finger stone to behave like a small bench stone. Thinning the last bit takes thirty seconds or less on a fine stone; the more water, the faster it goes — and while you're at it, you tailor each stone to the shape of your own finger. Before committing to a large surface, test at the tip.
Can't I make finger stones from a bench stone? Even with the finest machine cutting — the flattening losses, the plates that crack, the grinding to thickness — 94% of the original stone is gone before a finger stone is finished, on a good day. Start instead with a hammer and chisel, and even on a perfect day, the waste passes 99%.
The spine and the heel. Both are small surfaces where a bench stone simply can't work — this is sandpaper's one honest job. For a harmonious scratch pattern, start from the heel and travel slowly, one way, toward the tip. For more control — and to keep the scratches on the heel rather than straying onto the jigane — wrap the sandpaper around something hard: a pen, or the shaft of a screwdriver.
Every effect on this site is photographed the same way: the same blade, the same angle, the same light. When two surfaces look different in these images, the difference comes from the tools.
