Yes, 4th from left on top gets me every time, I neeeeeed the “iromono” coti hahaha
You reminded me to dig this one out yesterday for a proper in-depth look at it. I'd used it a handful of times before, but originally I'd been a bit precious about not wanting to wear away the 'tan'. Seeing as it's not that though, no reason not to put it through its paces more extensively, like I do with most stones when I get them...
This is another very fast Coti, almost but not quite as quick as the recent one:
But here on the Vielle Rouge 'Iromono' it doesn't surprise me as much because it's also extremely coarse; probably the coarsest Coti I've had, the BBW it's glued to is a fair bit finer. Very bitey, bordering on ragged, knife edges because it was so difficult to cleanly deburr on.
You see how wavy the paper towel cut is there? That's something I see a bit on very toothy edges, particularly from cotis. The knife is sharp enough to cut though it, but it's not the really effortless drop you see in some of my vids. As the knife goes through - the half of the sheet that you're not holding begins to fall away, and if the edge is extremely aggressive it continues to dig in to it during that. It's cutting straight downwards in real 3d terms, but because the towel is falling away at the same time - the resulting cut is wavy. Higher finishes produce straighter cuts because they go through more easily and don't dig in so much.
Tried it on a razor too and it was nowhere near finishing level, not even playing the same game. I wouldn't put the finish level much beyond 2 or 3k. Quite even but very noticeable scratch pattern on the kiridashi here:
A peculiar stone, good for hyper aggressive knife edges, but objectively probably not the 'best' Coticule in the world. 'Tis one of the prettiest though.
