Chosera 1k

Chosera 1k 1

Naniwa Chosera 1k 

I’ve had a few different 1k-ish stones. The Chosera 1k is my go to choice for that task. I really get along very well with this stone; it’s fast, hard and it doesn’t need to be soaked; for me this is a splash-and-go stone. I did try soaking it in the beginning, but I never saw any performance boost.  I run water on it for a minute, maybe less – and then I start honing. If I need to add water – I just sprinkle a few drops across the top and that’s usually enough.    

I’m not certain what the abrasive in these stones is, but the average particle size has been documented to be 11.5 µm. Every whetstone has particles larger and smaller than the ‘average’ size, but judging by the resulting scratch pattern I see on razor bevels, it appears that the percentage of 11.µm particles is very high, and the spread of particle size is very narrow. The scratch patterns are consistently uniform in both width and depth.  

 The the binder is ceramic; this type of manufacturing process usually produces a somewhat harder stone that wears better and doesn’t get as spongy as one with a resin binder. Like most of the Chosera stones, the 1k is hard and fast; the hardness is sterling for keeping the bevel true – even when the stone has been wet for an hour, it still cuts a flat bevel.  

The stone in this photo is one of two Chosera 1k stones that I use. In the photo, you can see that I cut this one down. I did that for a few reasons – first, so I can travel with it easily; it fits into my carry case nicely. Also, I use the short end-piece to make slurry, clear swarf, and re-surface the top of the stone.   

These stones come with a red ‘rubbing’ stone in the box. That’s not a slurry stone, it’s for clearing swarf off while honing and dressing the working surface. It needs to be soaked a bit before using it – I leave it in a plastic tub in the sink while I’m honing. I find that I like using the 1k C ‘Tomo’ better but both options work well. 

The slurry from this stone is very green and it can stain towels or clothing. The stains seem to wash out easily enough though. I hone on a rubber block on top of a rubber mat so I don’t have any issues with the slurry getting on countertops or whatever, plus I’m usually pretty good about keeping slurry on the stone. 

As mentioned above, the scratches on the bevel left by Ik C are quite uniform, and wiping them clean with the 3k Chosera is a piece of cake. Going from this stone to Botan slurry is also do-able, and the same goes for most Coticules. Most of the time, when I follow the 1k C with a natural option, I find that I usually need to put in some extra work to clear the entire scratch-pattern.

Naniwa manufactures their Chosera stones in at least two styles – with and without a plastic base. I prefer to use baseless stones so I can lap both sides flat; doing so allows me to flip the stone when I need to. I also lap one long edge for when I need to concentrate on a small section of a blade. 

Approx. Dimensions: 8.25 x 2.25 x 0.9” / 210 x 57 x 23 mm

Weight: 32 oz / 904 g

Chosera 1k Slurry Stones.jpg


© Keith V Johnson 2014 - 2018