Recent content by Miguelito's Blade

I used a diamond plate on the 220 and found that it had penetrated below the surface but the stain was smaller than it had been. The usuba took a decent edge in just a few minutes so I flattened it past the nicks in the edge and have started thinning on a 120 Suhehiro Debado. It is producing...

I experience the same thing with my good knives, i.e., they discolor the stone; however, the discoloration is nothing like what I am experiencing. I don't think that you are referring to the ordinary swarf that forms, because even though it discolors, what doesn't wipe off is easily removed...

- I have intended to find out if any of them will sharpen. If not, then that ends the project right there; however, if they will take an edge, then I will spend the time and effort to refinish them. As luck would have it, I am disabled and have all the time in the world to work on knives...

No. That is not happening because I've tried both ways you suggest and a good knife against either the stained side or the clear side produces nothing other than what it always produces. When I first realized that the stone was stained with this substance, I feared that my stone was damaged...

Yes it is a clad line. As I understand it, nimai cladding is a carbon core clad in iron. Is iron known to produce such a substance? If it is, then all four knives are trash.

As far as I know, they are all Japanese. When I purchased these three knives, I also purchased another usuba from a different seller. Upon taking it to my 220 stone, it did the same as the others, as the previously shiny areas became covered with the same substance. The fourth photo is my 220...

Great suggestions. I will try them today and post the results.

Both stones have just been flattened with a diamond plate and cleaned with a nagura stone. What makes it all the more puzzling to me is that all three knives do the same thing.

In the first photo, I have been grinding it with 60 grit sandpaper and it is bright and shiny. In the next photo, I have made six passes on a 220 grit Shapton ceramic stone, which produced the gray substance leaving the blade gray and dull. The only way to remove it that I have found so far is...

I did wash them. I scrubbed the bejesus out of them and turned some of the kanji characters from black to white. I've been working on the usuba and will post some photos later tonight of how the gunk turns a bright ground blade into a dull mess.

Thanks for the replies. I'll keep grinding. Also thanks for cluing me in as to the type of steel.

A 220 Shapton ceramic and a 500 Shapton glass. The steel, as far as I can tell, is stainless, based only on my extremely limited experience and knowledge of steel. In other words, I could not find anything that indicated to me carbon steel such as evidence of clad construction. I purchased a...

So I picked up three damaged knives on ebay to practice on. When I took one of them to a coarse stone to start refinishing it, I noticed that a gray sludge formed immediately after a couple of strokes. I wiped it off, and it just smeared onto the blade and instantly dried. It would not wipe...

Thank you all for your responses. The reason I was looking at the santoku is that I have discovered that I prefer push pull rather than rocking. While using my gyuto I find myself wishing for a flatter edge profile. I am looking at single bevel knifes simply because I want to learn how to use...

I started out looking for a Santoku, but my search eventually led me here: Sakai Takayuki Tokujyo Supreme (White 2 steel) Japanese Chef's Kengata-Gyuto Knife 210mm KIWAMI[ULTIMATE] I have also been looking for a single bevel knife; I have yet to try one but I believe the time has come. I would...